I have expierenced everything you have mentioned. I went on a 3 week binge and paid the price. After the 2-3rd day I stopped I expierenced the crash.
Your headaches and cold sweats will get better in the coming weeks. You need to take anti oxidents and drink plenty of water to help clean all the neurotoxicity. Your serotonin level is low and your body is having trouble managing your temperature, sleep and appatite.
Taking 100-200 mg during the evening will help restore your serotonin but do not take for more than 5days or your body will start depending on it. Green tea extract is a excellent antioxident and helps with the transport of 5htp through the blood brain barrier (correct me if I'm wrong) I take it with the 5htp.
I believe thoes dreams and brain shocks(brain zaps) your having are realated. The zaps are a form of withdrawls, its a chemical imbalance caused by your brain going in overdrive to produce chemicals you drained during your binge. I found that when I would be going to sleep that's when I would expierence the zaps at its worst and get the dreams. Mines lasted for about a week (each person is different some will have it longer) and let me say thoes were the most vivid, and scariest dreams I ever had. Some nights I thought it was so real ill ask my room mates if they heard me screaming there names for help. And thoes zaps can be painful, I found smoking weed increased the zaps, so I don't reccomend smoking until the zaps are gone.
You will feel like your getting worse befor you feel better imo. My emotions drove me crazy, I cried for the first three days and gave up on everything for the moment. After about 6-7days I began to start to feel better and have a positive outlook on life. It took a month or so for my emotional rollercoaster ride too end. I learned a new repect for MDMA and understood its not something to abuse or you pay the price.
My advice to you is be strong and know that each day you will feel better. Your body and brain have taken a toll from the abuse and need all your help to get better. Eat healty and drink plenty of water, get your vitamins and antioxidents, and exercise. Keep your self busy esp if your feeling down or depressed.
The most IMPORTANT thing is to take a nice long break! No less than two months. 6months sounds better. I wish you the best of luck and hope your able to get through this.