Hi, I Had Colon Cancer Surgery Mid July. It Has

Hi, I had colon cancer surgery mid July. It has been a long recovery. I have had my followup checkups with the surgeon and a regular physical 3 weeks ago. It was a right colectomy, partial removal of my intestines and reconnect to my colon. Over the last couple of months, I sometimes wake up around 2 or 3 am with pains in the middle of my stomach....about 3 times during the week. At least one or two of those times, besides feeling nauseated...I sometimes throw up. Is this normal?