A Few Minutes to Play With My Worrystone

I'm known for being a worrywart. Obsessively actually, and I'm worrying a lot the last few weeks about a close friend of mine. He isn't acting like himself, and I'm not sure if there is anything that I can do to help. He drinks a lot, says hurtful things, doesn't follow through with plans, and is acting distant.
I know that there is nothing I can do about it, but feeling helpless isn't something that I'm good at. I know he's graduating is stressful, the unknown is scary....but I don't feel like lashing out is the way to do it.
I guess the only thing that I can do is to be strong, and hope this gets worked out soon.