People please help me :( I don't know what's wrong with me?

4years ago I started experiencing tingling in my vagina it didn't go away for days and I think I added to it by constantly thinking about it and stressing, I fell into depression as it wasn't painful just constant and distracting. It would sometimes go away but soon as I had a wee return. But I went on holiday drank loads btw I was only 17 and I relaxed had fun and returned feeling fine, however it came back whenever I stressed over anything - alevels - and I would be scared it would come back so it would it ruined christmasas etc.. Eventually I started getting recuring utis, and kidney infections and after year nd half of constantly going drs and hospital I was diagnosed with painful bladder syndrome/IC and put on amitryptaline. I felt better and for a year felt fine, had a wonderful christmas etc - but I feel it was me not stressing that helped. Then 2weeks ago it came back worse than ever constant tingling etc, I know its persistant arousal syndrome, or so I diagnosed myself but now I'm getting shooting tingles down my left leg and now my right and its causing discomfort in my feet and even in my arm today so I'm wondering if there could be something wrong - the tingling goes down my leg and up to my vagina, I feel depressed nd spend every night crying feeling suacidle, I work full time in a demanding job and I feel I can't cope anymore. I'm only 20 nearly 21. Underactive thyroid does run in my family but when I've been to drs in past they've never suggested checking it. Does anyone have any ideas what could be wrong?