You should be eating solid foods, after only 2 days maybe 3. As soon as you start passing gas, they'll give you clear liquids, then go a little higher, then something like a low residue diet, which is solid food, just easier to digest food. You might be in the hospital I'd say on average 4 days after your surgeries, maybe a little more, and i've even heard less. I have never had an internal abcess like that, but I have had many resections and abcess elsewhere.
Returning to work all depends on what your job is. if its a desk job, maybe as soon as a week. so a day or two after getting out of the hospital, because you will need rest when leaving the hospital trust me, you wont get much in the hospital. in the meantime you should still be able to excercise, i just wouldnt be doing any heavy lifting with free weights per se, you might be proned to a hernia more easily because of the abcess. Now after the surgery you will want to wait weeks before going back to the gym though, you'll have to fgradually work your way back to where you were prior, but if your in pain now then you'll be glad you did it when its all over.