I was there too, SG. Did you ever look into that book I mentioned in a much earlier post? The Feel Good book by Dr. David Burns isn't a cure all but it helped me to get my thoughts in order when I was at my lowest. It covers a lot of ground between depression, anxiety and low self-esteem. Its hard to absorb it all in one reading so its good to go back to it often.
Amazon has it along with some of his other books.
BTW, sometimes a break, like the one you are getting is the best solution. If my mom didn't take me in after my breakdown, I don't know if I'd still be here today. You may feel guilty about burdening your parents now, but when you get back on your feet, both you and your parents will be glad that you did.
ETA: when I say 'glad that you did', I of course meant glad that you 'burdened them'.