Stomach "spasms" one year post op

I ended up sick a few weeks ago and threw up for a couple of days. I've noticed since then I get this occasional spasm-like feeling in my stomach. I can literally see it jerk. It's almost like my stomach gets hiccups. It can last a few minutes to maybe a half hour then goes away. Its happened a good half dozen times. Its not painful just odd. My illness may not of had anything to do with it, but I worried with the act of vomiting maybe I pulled something or god forbid, damaged something. Have any of you ever experienced this?