1.Take vitamins & minerals, specially D3 + B complex (if you are D or B12 deficient it is way worse)
2. Stop with drugs, alcohol, coffe for some time
3. Stop masturbation for 1 or 2 months (very important, masturbating mess up your already messed neurotransmitters and brain hormons and affect nervous system, specially if its excessive like going 4 or more times a week and this is just so true although modern medicine doesnt agree, you even have noFap forums and specialists in some countries like in for example India, it can be huge problem if you masturbate daily while having dp/dr. My experience masturbating 3-4 daily for few days brought me nervous weakness and brain fog at the time i felt 90% better, and i had to battle those for a long time)
4. (Most important, key to recovery) Exercise! Intense exercise, every day driving bike outside for 4-5 hours is best for recovery. Also push-ups, martial arts weight lifting is very good, u can do it 1-2 times weekly and rest of days cycling. Best remedy for "unreal" feeling is, cycling for HOURS a day. Read this thread,
http://www.dpselfhelp.com/forum/index.php?/topic/54514-how-strenuous-exercise-helped-my-dpdr/ but dont think you will get cured in just 3 days like this guy, i needed 8-9 days of vigorously doing it to feel significant difference)
Thats it, if you follow this routine for 1-2 months u will be cured, or atleast 90% better which will make it livable. It is very hard to start it, but if you are strong and willing to do this u will get back normal. Also i repeat this doesnt count if you have something serious like lyme disease or something but will still help you greatly, although u first need to treat disease. Breaking rules i mentioned (excessive masturbating, taking drugs, taking alcohol can make u relapse temporary or make you feel temporary worse). Good luck i just try to help someone