First off, you should definitely ask your doctor, since depending on what your bloodwork, etc. says, maybe it's not a good idea for you.

That being said, where are you getting the 5,000UI number from? The dosage recommendation for vitamins is dependent on if you're treating something specific or not. It sounds too high and may cause side effects unless you have some type of condition that is requiring that amount of Vitamin D, you should be careful. According to the source below, if you're a normal healthy person, you should be shooting for 600 IU per day, some/all of which you can get through normal exposure to sunlight.

From the Mayo Clinic: The new 2010 recommended daily allowance (RDA) is 600 IU for those 1-70 years of age and pregnant or breastfeeding women, and 800 IU for those over 71 years of age. An adequate blood level of vitamin D is 20 nanograms per milliliter, which can be achieved through daily skin exposure to sunlight. Levels over 50 nanograms per milliliter may cause side effects.

http://www.mayoclinic.org/drugs-supplements/vitamin-d/dosing/hrb-20060400

First off, you should definitely ask your doctor, since depending on what your bloodwork, etc. says, maybe it's not a good idea for you.

That being said, where are you getting the 5,000UI number from? The dosage recommendation for vitamins is dependent on if you're treating something specific or not. It sounds too high and may cause side effects unless you have some type of condition that is requiring that amount of Vitamin D, you should be careful. According to the source below, if you're a normal healthy person, you should be shooting for 600 IU per day, some/all of which you can get through normal exposure to sunlight.

From the Mayo Clinic: The new 2010 recommended daily allowance (RDA) is 600 IU for those 1-70 years of age and pregnant or breastfeeding women, and 800 IU for those over 71 years of age. An adequate blood level of vitamin D is 20 nanograms per milliliter, which can be achieved through daily skin exposure to sunlight. Levels over 50 nanograms per milliliter may cause side effects. http://www.mayoclinic.org/drugs-supplements/vitamin-d/dosing/hrb-20060400

I talked to my derm he didn't really say anything

I was getting the numbers from a lot of places mainly here if you type in vitamin D and acne the review for vitamin D comes up and I didn't read one person below 5000 they are/where taking 5000 some 7000 so now I'm a bit lost, I might just take 1000UI

Also I get no sun what so ever as I'm on acctuane I try avoid it at all cost.

There's a debate on raising the RDI of Vitamin D3 higher since the current recommendation might be too low. I personally take 2000IU a day for every day supplementation. I don't take any Vitamin D3 on days I get plenty of sun since your skin can easily make enough Vitamin D3 that your body needs for the day from just 15 - 30 minutes in the sun. There's also additional health benefits from getting Vitamin D3 from the sun rather than through supplementation as well. Also, if you're going to take high Vitamin D3, it is suggested to supplement with Vitamin K2, MK7 (50 - 100mcg) as well since the body needs Vitamin A, D3 and K2. Lastly, I've heard that Vitamin D3 is important for raising the body's Vitamin A toxicity threshold. So I personally wouldn't stop supplementing with Vitamin D3 if you're on Accutane, especially if you're going to avoid the sun.

Here's the recommended dosage for Vitamin D3 from Examine.com.

How to Take (recommended dosage, active amounts, other details)

The recommended daily allowance for Vitamin D is currently set at 400-800IU/day, but this is too low for adults. The safe upper limit in the United States is 2,000IU/day, while in Canada it is 4,000IU/day. Research suggests that the true safe upper limit is 10,000IU/day. For moderate supplementation, a 1,000-2,000IU dose of vitamin D3 is sufficient to meet the needs of most of the population. This is the lowest effective dose range. Higher doses, based on body weight, are in the range of 20-80IU/kg daily.

Vitamin D3 supplementation (cholecalciferol) is recommended over D2 supplementation (ergocalciferol), since D3 is used more effectively in the body.

Vitamin D should be taken daily, with meals or a source of fat, like Fish Oil.

I would personally trust the Mayo Clinic, generally considered the top medical facility in the U.S. over Examine.com and Mercola.com. But it's your body, so do what you want. Also note that "safe upper limit" is not the same as "optimal amount." Just because it won't kill you, doesn't mean you want to be taking that much.

Note that if you google "side effects of too much vitamins" -- Vitamin D is commonly cited as one that people may be taking too much of. For example: "Dwyer says vitamin D, calcium, and folic acid are three nutrients you may get too much of, especially through supplements. Adults who regularly far exceed the 4,000 international units (IUs) daily safe upper limit for vitamin D might may end up with serious heart problems." http://www.webmd.com/food-recipes/effects-of-taking-too-many-vitamins?page=2