Alana - I had my tonsils taken out a few years ago and I wasn't in bed for two weeks. Not sure why they told you you would be? I just couldn't talk or answer my phone at work - that was kind of nice actually! I definitely wouldn't say it was a fun experience, but I didn't really think it was that awful. I did miss solid food, but hey, I lost a few pounds! I had had mono previously and it basically destroyed my tonsils so I was just relieved to get them out. You WILL need a humidifier though. It's important to keep your throat from drying out while it is healing. It REALLY hurts when that happens. Also, they will probably warn you about this, but when you wake up, don't panic when you can't feel yourself breathing in. The whole back of your throat will be completely numb and the natural reaction to kind of hyperventilate a little when you first wake up and can't feel anything. It's no biggie when you know it will happen, but if they don't warn you it can freak you out a little. Stock up on jello, pudding, and ice pops. Stay away from anything acidic or high in sodium. After a few days depending on how doped you are on medicine you should be able to do some light exercise. I would stay away from any intense cardio whille healing, but weights should be fine. Trust me, gaining weight will be the least of your problems. You will not be able to eat enough to have that problem.
p.s. You will probably want to also stay away from a lot of dairy products right at first. That always causes phlegm (gross word) to develop in the back of the throat and you'll end up having to gargle with salt water to clear it out. Sorry to be so gross, just trying to think of everything. Anything high in sugar will do the same thing.