Worried

Hi, I'm a 48 old male who had bariatric surgery in 2012, I have since lost over 13st but have had multiple health issues. But recently I have become very tired and after speaking to my mental health support worker she said she I should talk to me GP, since then it's all gone full steam ahead. I had a fit test score of 21 and a faecal calprotectin contact score 112 ug/g. I have lost 1.3 stone since Feb of this year with no dieting. I'm worried sick which is strange as I have been suicidal since 2013 but the thought of my wife having to look after me if I have cancer has worried me for her. I have my colonoscopy on Thursday so please wish me luck.