I realized this is kind of a rant lol sorry

I’m 20 now and I’ve been diagnosed as ADHD when I was like 10, then bipolar In a psych ward at 13, major depression around the same time &amp; generalized anxiety. Bipolar again in the hospital when I was 15 &amp; 18. I was also diagnosed as borderline when I was 18 and now recently my therapist was taking to me about histrionic?
Anyways I’ve been taking anti anxiety meds since I was 13 &amp; every anti depressant u can think of. I’ve tried anti psychotics, mood stabilizers, adhd meds. Now I’ve been taking Valium &amp; adderall for over a year, I just got prescribed ambien for insomnia (as needed) &amp; now I just got gabapentin. I read it’s helped people with bpd and anxiety &amp; I also have really bad pain that makes my mood swings way more intense. 
Can anyone tell me what the hell is going on &amp; if they’ve taken these meds before, how they’ve worked or didn’t work? I’m really curious about the gabapentin and if that’s helped anyone because I really need mood stabilization at the moment due to recent events &amp; I can not deal with the pains anymore it’s driving me insane. 
Oh I also forgot to mention I’m switching from adderall to focalin to see if that helps get rid of the pain 
If you read this &amp; or reply thank u in advance, if there’s any questions I’ll try to answer tomorrow asap but it’s 6:30am and I need to try and sleep!