Obsessive worry over family member

I have an anxiety condition and have had for years. Over the last year or so my brother has been going through a bad time. Gf left him, he hit the booze hard and because of this he left his job he to move to something less stressful which he now hates. He has good days and hard days from what I can see. I give him some help financially to ease the stress.

But I am constantly and obsessively worrying about him. Im checking online constantly to see when he was last online and am always thinkingabout worse case scenario where he loses his job, his home and spirals out of control. It gets to the point where I wake up feeling physically ill. I know he still drinks though not to the extent he has before he even admits to this. But the constant worry is starting to really negatively affect my every day life.