wicky,
I am so very, very sorry to hear of your struggles. There are a lot of people that can identify with how you feel. You aren't alone. Acne on the chin area is related to hormones, and greens actually help to regulate hormones, so I'm hopeful that you will get some relief from the smoothies. Definitely give them some time to work, and you might consider supplementing with DIM (naturally found in cruciferous vegetables) if you don't get the results you're hoping for, as DIM helps with hormones.
Are you getting good oils into your diet? Make sure you are getting a good DHA oil (I like Carlson's fish oil), and you might consider borage oil as well.
I would be more than happy to help you with your diet and offer suggestions - just send me a PM. Also, I think you'd find help and encouragement as well by reading Alternativista's posts (she has some in the stickies section at the top of the forum). Your story reminds me of hers.
You have already made amazing changes in your diet - that is definitely an accomplishment. Don't lose hope, as it can sometimes take several months before changes are seen. At least you know that in the meantime, you are making wonderful strides for good health and doing such a positive thing for yourself. You are on the right road. I would focus now on getting as many high-nutrient foods into your diet as you can. It's actually really simple to do and very tasty as well. With time, I think you will get there. Again, I am more than happy to help.