What Is The Reason For Abdominal Pain Having History Of Rectal Cancer?

I am a female,54. One and a half years ago I was diagnosed with rectal cancer. I had radiation everyday for 5 weeks along with chemo 24/7 for the same 5 weeks. Surgery followed this. The part of the rectum that was cancerous was removed along with 32 lymph nodes. The pathology report stated that I had clear margins and no lymph nodes were cancerous at that time. Before the radiation and chemo, I was told a few lymph nodes were enlarged,they looked suspicious----maybe cancerous. I had an ileostomy for 7 months. During these 7 months I had chemo (folfox 6) every 2 weeks for 4 months. At the end of the 7 months the ileostomy was reversed. I have regular check ups and everything so far is good. I also have severe peripheral neuropathy from chemo. This developed 2 months after chemo was done, I have seen a specialist for this as the burning was more than I was able to handle any longer and it was keeping me from sleeping. For this problem I take .25mg ropinerole which has taken the burning away but not the pins and needle and numbness feeling. I am able to tolerate and sleep now though. I also take paxil 20mg for anxiety and zopiclone 7,5 mg for sleep. Anyways, for the past month I have been having upper abdominal pain, just above my belly button. Its a throbbing pain not real severe, but it can get real bad , mainly at night. When it gets bad at night the pain is like contractions. They spike and then subside. It can go on for hours during the night. For a few days after a bad night my abdomen is tender. After the tenderness goes away I have no pain for maybe a week and then I have another spell. No other symptoms. Just wanting another opinion. Thank you so much.