Your depersonalization will go when you recover its not permanent.

You should be taking Vitamin D. There are two studies Im aware of that point to Vitamin D levels and improved sleep. They identify the range of 60 to 80 as the zone to strive for. According to the vitamin D council you can take up to 10,000 mg per day of vitamin d3. my son took 12,000 for a few weeks and then moved down to 8,000. Vitamin D is a hormone not a vitamin. Its very important in many aspects of human physiology and I believe can protect against concussions. There are studies out there on this you can google. also see this

A Concussion-Free Football Season: How one High School beat the odds - July 2�12 | Vitamin D Wiki

According to Dr Komer who helped my son recover from his concussion you should be taking 3,000 fish oil per day in addition to the Vitamin D.

Dr. Larry Komer, MD - Home | Facebook

I recommend you check him out on the web.