You should expect some swelling if you have had a lot of work done, but not to the extent you are describing (my impression from your description at any rate).
Sharp spasms and twitches and tugs and so on I certainly did have for 3 months or so after, and especially if I had overdone the activity by lifting something too heavy or straining on the loo or trying to do too much generally. Even reaching over my shoulder for the seatbelt in the car could have me wincing for a few hours in the first 8 weeks.
If your bloat is really tender and hard and swollen then it suggests you might have got an infection in there, and to be certain that you don't please see your GP to be checked or call the gynae ward that looked after you, to get their opinion. They might want you to come in and be checked over by their staff who are experts in gynae surgery and what is normal and not. There should be a telephone number for the ward on your hospital discharge form.
It doesn't sound quite right to me, I certainly was very sore and tender for several weeks, but not with a hard swollen tummy. Swollen yes to a small extent but i could still do my regular jeans up, though prefered to keep the flies open when no one else was around, so probably a 2-4 inch expansion of my waist from normal. About the same as the premenstrual swelling I would get before periods.
Hope you can get satisfactory answers soon and the problem resolved asap.