I second that you should abstain from all substances that affect GABA and/or glutamate before you start feeling better at least for half a year or more. Caffeine is a GABA antagonist, so it will lower your GABA levels and lead to increased withdrawal symptoms. Cannabis will do the same as it reduces GABA release. All stimulants affecting monoamine levels are a big no-no as they will add to excitatory overdrive. Alcohol has a wide spectrum of effects impacting both GABA and NMDA receptors, so it will make withdrawal worse. At first it may alleviate some symptoms if you drink enough, but once it wears off, you're going to suffer even more. NMDA antagonist dissociatives are another class of compounds that can alleviate symptoms at first, but they will aggravate the withdrawal once the effects wear off.
I'm not really sure about nootropics like piracetam. They may have some modulatory effect on NMDA receptors or increase glutamatergic neurotransmission indirectly. From what I remember, 2 years ago when I took piracetam after using DXM at low doses for a week or so, it increased my anxiety and depression. However, I've been on 600-1200mg of piracetam for a couple of months now again and it seems to help me concentrate better a tiny bit. It's been almost 2 years since I quit benzodiazepines and I can drink two cups of weak coffee a day with no big problems, however, caffeine still affects me more strongly than it used to and I abstained from it during the first year after quitting. I'm also kind of addicted to tobacco snuff and it sometimes makes me anxious if I take too much, so staying away from tobacco may be a good idea too.