Thank you for taking the time to respond.
My suggestion would be to try NAG initially, say at a dose of 700 mg two or three times a day, and see if that helps reduce anxiety levels. If it does, I think that may indicate that you have brain inflammation causing the anxiety.
However, a quick Google search indicates that large doses of MDMA can destroy serotonin axons, so perhaps in your case, a down-regulated serotonin symptom due to loss of axons may be the cause of the anxiety (anxiety is most strongly linked to the glutamate and serotonin neurotransmitters).
So in this case, supplements that boost serotonergic response could help. These include high dose inositol (probably the most potent serotonin boosting supplement), L-tryptophan, SAM-e (S-Adenosyl L-methionine), Garcinia cambogia, Rhodiola rosea, cat's claw and neem.
Another approach might be to try to regrow the lost serotonin axons, assuming this is your issue
. One supplement that specifically promotes axon regrowth is inosine (not to be confused with inositol), which you could take in doses of say 1000 to 2000 mg daily.
The brain nerve growth factors NGF, BDNF and GDNF promote axon growth:
Brain-derived neurotrophic factor promotes the survival and sprouting of serotonergic axons in rat brain
The nootropic supplement noopept increases NGF and BDNF in rat hippocampus, so this might be useful. Doses are around 25 mg of powder, taken sublingually. The supplement 7,8-DHF (7,8-dihydroxyflavone) acts like a potent BDNF, so this may be useful.
The supplement idebenone (an analogue of co-enzyme Q10) promotes NGF secretion. The supplement naringin (found in grapefruit) increases GDNF.
The Russian drug cerebrolysin increases BDNF. Ref:
1
Any other supplements that promote brain repair may be useful, such as fish oil.