Talk to Gastroenterologist on GI Disturbance

I’ve had issue of rectal prolapse from 3-4 years accompanied by rectal bleeding as it occurred occasionally i never worried about it. But recently i had severe rectal bleeding with normal stool which made me worried and felt weak. I’ve been feeling weak lately as suddenly I feel like losing all my energy. Also my bowel habits are changed as i’m constipated once and then suddenly I’ve very normal-loose stool. Today again I felt some blood in my stool. I felt something like hanger pangs but they didn’t subside with eating and made me very uncomfortable and then they turned into extreme burning pain in my abdomen particularly on left side radiating to my lower back and mid thoracic region. Im worried of it to be signs of rectal cancer. Can you please guide what should i do in this regard