Spraak-
Assuming you aren't exceeding ohh, say 4mg of the Zannies a day, it is highly unlikely that you
caused anything of the sort - just stop thinking like that, don't beat on yourself. I'm going to break this down by the drugs in question.
Diphenhydramine/Benadryl
An OTC antihistamine (anti-allergy) med many people use for sleep and of course also
marketed as an OTC sleep-aid because it carries a strong side-effect of drowsiness. It is
non-narcotic, and
non-addicting in that you won't get specific or life-threatening withdrawals from it.
I've used the stuff
nightly for years and years and years - hardly a good practice - but it is not known for "causing" a bipolar or depressive disorder.
However, when used as a sleep aid, it is
habituating and
dependence-producing if you use it every night. This is because anything you take for sleep, the body gets used to; even if non-addictive, the brain comes to expect that "nodding off, cloudy" feeling and before you know it, you a damned OTC "addict" who makes sure he/she is never out of liittle pink pills in order to fall asleep. LOL
Xanax
Entirely different story. By definition, non-narcotic because a narcotic generally refers to opiates or opioids which relieve pain as well as inducing stupor or a genuine high.
But it is a very potent benzodiazepine, in the same class as Valium and Ativan, etc. and is most definitely addicting.
Used together (simultaneously) --and
this is generic information I'm giving out, not medical advice-- there is no specific contraindication that they'll cause psychosis or anything of the sort other than increased drowsiness.
Having said
ALL THAT (

lol) - I gotta refer you right back to
ccgirl and say make-a sure that your doc or pdoc knows your concerns.
You HAVE to communicate all your concerns spraak to your doc. Else, they can help you no more than we can.
Ok?
John