In reply to Imedio:
Speaking from experience (smashed up my foot several years back), it helps to make a list of all the stuff you can do.
Fingerboard (be careful not to push it too much when you've only been climbing for 18 months, but you can do a lot more when you're not also climbing), pull-ups.
Anything that can be done seated or lying down: this is a great time to do all the antagonist stuff you may have been neglecting, as well as all the fiddly boring shoulder prehab stuff with resistance bands or tiny weights.
You can also do rows, reverse flyes, and other stuff that'll build up useful strength for climbing. Eva Lopez has a good post:
http://en-eva-lopez.blogspot.com/2012/04/specific-weight-exercises-for-clim...
Lots of stretching -- there's a tonne of yoga you can do sitting or lying on the floor, it's just a question of logistics manoeuvring with a cast on! Plenty of hips/hamstrings and shoulder stretches are do-able.
Also, if you're a geek like me, I recommend watching a load of classic climbing films while stretching. It helps mitigate the cold turkey. *g*
I sent round e-mails to my climber friends and invited them all to come and eat pizza and watching climbing movies with me while I was out of action, to help keep me from going stir-crazy (and losing touch with everyone). It helped a lot!