I know, but I thought you might've read it by then.
Guitar's always worth playing, I think. You can accompany yourself (unlike many other instruments, being mostly single-line), bring it along with you (unlike a piano), and it goes with most songs.
It's probably easiest to learn basic musical structure on the piano, but guitar's a really great instrument I think.
Violin's a bitch to get in tune, yeah.
Have you been extra miserable the last few months, or just more open about it?