Help I think I hurt Myself

Help!! how long will it take for muscles to feel better if I hurt my tummy muscles? I had surgery on aug 31. I started to excercise in water. I think I did something. My belly is so sore. It really bad hurts allot. I have sharp pains and continual soreness. If that's what I did, how long will it last? Cause if it is something else, then I will need to go to the dr. I dont want to go needlessly though. Sheila