Affected by sick brother

[Nilef]

For the past two weeks, i've had difficulty eating, and when I manage to eat, I end up throwing it back up. I've lost weight, and I was already the average for my age and height.
This is probably due to the emotional state i'm in right now mainly due to my brother being seriously ill. He has been in and out of hospital, and keeps collapsing, but they keep taking him in and then letting him out. I'm also Bi-Polar and my relationship with my girlfriend whom I love is taking a toll. I instantly become sad when I have no contact with her, go into a terribly bad mood when shes sad etc. The problem is, I love her, and I can't just let her go.

I don't know what to do, who to turn to...what should I do?