Have tried a hell of a lot of supplements. L-theanine and magnesium taurate seemed to bring some slight relief but that didn't last. Interestingly they both act on GABA
At the moment I am trying a probiotic and prebiotic diet that I have never tried before. Only a slight effect on DP but feel the most physically relaxed I have in YEARS! Also sleeping better. These bacteria act by increasing GABA and also increase GABA receptors in the brain! It's only been 9 days which is actually quite amazing. Currently taking:
B-gos (increases bifidobacterium- have it in my morning gaba tea) (fiber also found in chickpea (hummus) and beans)
Inulin (also bifido and acido amongst other healthy bacteria- have this is my afternoon + evening tea)
Yakhult (non brand) in morning- L. casei
L. acidophilus and L.rhamnosus 1 pill every meal
Cottage cheese lunch
Kimchi - high in GABA and GABA producing bacteria
http://aem.asm.org/content/77/7/2264.full
Tempeh- bit gross but also has rhizopus as well as other Lactobacillus baceria
Taurine- increases gaba enzyme of body
P5P (B6)- most absorbable form of b6 and is needed to produce gaba
Magnesium sulfate (epsom salts)- Magnesium increases gaba and acts at GABA receptors
GABA tea- has high gaba levels and gaba forming bacteria (though I don't know if many bacteria survive)
Long list and fairly expensive but noticing really positive results so far. More than any other medication/diet/supplement I've taken this far. Reviews of people claiming these bacteria cured long term depression/anxiety are all over the internet! It's actually unbelievable, I've heard it again and again and always thought it sounded ridiculous that it could be related. But my DP did start with very severe abdominal pain after eating weed so feeling very hopeful!