What kind of doctor should i consult?

I've had low blood pressure since i was 11. When i get up(not always) i experience a blackout (my eyes stay open but everything turns black i can't see and i loose control over my body and i fall). The intensity and duration varies, sometimes i am able to reach a safe place or get through without falling. But at times, although feeling paralyzed and not able to see, my body starts moving here and there as in vertigo, i end up getting injured too(i don't feel pain while like this). Also my bones and muscles feel weak ie even a little pressure that i didn't think of as much feels painful now. My elbow, hand and knee joints are in constant pain, the intensity is low but the duration makes is difficult to edure. I've also been having many headaches that often last for a day or two. I'm also dealing with depression (2 years) and anxiety right now. So what kind of doctor should i consult? Because for these 10 or so years I've never had a proper diagnosis it's crippling my ablity to live lif