post bladder sling limits or caution to injury

:'( tried to do some situps and couldn't because so much pain in both sides of lower abdomen. just wonder if i strained a musle or did some damage to my bladder. i don't understand because i had surgery in 2004 and have been very active ever since. i did put heating pad to it but i had severe pain when it happen and had nausea, ears closed and temp blindness. i couldn't get up out of the floor until i ask God to help me and He gave me the sstrength to get up. i am worried about maybe pulling some muscles but can't understand why it hasn't happened before after so many years. please give me soem advice. thanks Jean D. Townsend4