Open Colectomy done in Jan, 2026. Now still seeing blood in stools

I'm having some of the same symptoms as before Colectomy. The thing is, I don't know if there was still something left behind. Is that possible? I also don't know if I could go back and complete this journey again. It was months before I felt better after surgery. I'm 71, with Rheumatoid Arthritis, high blood sugar, a just diagnosed melanoma, after having 2 others surgically removed. How could it be back in 6 months, or could it have been missed during surgery. I don't know what to do, and my son is getting upset with me.