Glad to help.
Alright, but please bear in mind that I'm not a licensed medical professional.
While I agree that being on medication sucks in many ways, I also think you should beware of how your body feels at each successive step you take, and make sure that each step is slow, or your brain might incur damage. I think that its good you want to get off the meds, though.
I'd imagine that the gabapentin/alprazolam will be the most difficult to get off, citing their GABAergic activity, the latter probably more addictive than the former. Gabapentin is actually becoming more popular as a less addicting benzodiazepine substitute. But I'd still imagine it extraordinarily painful to even taper down slowly. As a side note, gabapentin's mechanism of action isn't fully known.
If I remember correctly their was a big scandal a few years ago when gabapentin was being marketed for bi-polar; its not supposed to be approved for that disorder, so I believe you should at least re-evaluate the person who gave it to you for that.
Basically, if you have to stay on gabapentin or alprazolam (on a GABAergic, in short), gabapentin would probably be the better choice (citing addiction and tolerance issues), but this would be a good thing for you to research on the internet too. I would also strongly recommend that you in the future not be on two GABAergics at once, since they may be very caustic to the brain in the long-term, not to mention short-term cognitive difficulties that almost all experience as a result of GABAergic drugs (even if they don't notice it!).
It looks like you've been on this higher dose of alprazolam for only a few months (not enough time for the really heavy addiction to set in). You may want to think about sparing yourself some future pain by trying to reduce your dose of that soon.
As you're looking at reducing or eliminating those first two meds, it would help tremendously to have some valerian root and/or kava root around (they work on the GABA receptors). The store-bought pills many say are useless, so try buying the whole root powder. It shouldn't be too expensive. Something to keep in mind though is that the pain of withdrawing is actually what you want, as your brain will, through this discomfort, eventually learn to make more of its own chemicals, and can't work its own muscle as well while being supported artificially. Bearing this in mind, try to never take enough valerian/kava or gabapentin/alprazolam that you feel perfectly comfortable, and your brain will heal faster.
You may want to look at raising your trazodone dose in the short-term so that you might sleep while withdrawing from the GABAergics. Melotonin and the aforementioned herbs would help too, not to mention skullcap and passionflower. Its not uncommon for people to lose days upon days of sleep while getting off this, shall I say, crap?
The omeprazole doesn't appear to be psychoactive. Were you planning on keeping this medication?
Peace