We've already got a written statement that exhibits most of the classic warning signs of depression. Does the poor guy need to submit it in triplicate before you'll take him seriously?

The OP should worry about the long run, but only after taking every necessary measure to get through the short run.

Meanwhile, whether or not any course of treatment is a long-term, sustainable, smart solution depends on the patient, of course. Therapy, both short-term and sustained, has markedly improved the lives of multiple friends and relations of mine, and drugs have very definitely saved the lives of a few, and that's just the ones I know about.

Don't undervalue the benefits of some short-term usage of medication to get back on your feet! I'm a little surprised that no one in these replies has suggested it, but please do consider it - it is a very smart solution! You'll feel better and might make some progress on your goals and then feel better about yourself again. And, heck, even if it is long-term, that's fine, too, don't let these folks be a judge of that for you.