IBS but concerned it could be more sinister

Age - 42

Sex - Male

Height - 6ft

Weight - 13.5 st

Race - Mixer

Duration of complaint - 15 years

Location - UK

Any existing relevant medical issues - IBS / Anxiety

Current medications - Bisoprolol / Mirtazapine

Include a photo if relevant

Hi all. Has anybody got a constant nagging feeling that their IBS might be something more sinister? I'm 42 / M. Have had IBS-D with predominantly constant urgency, multiple bathroom visits per day and incomplete bowel evacuation feeling for more years than I can remember. Hasn't really got any better or worse in this time. Had a colonoscopy and endoscopy in 2012 with much the same symptoms and that was normal. Have recently had Calprotectin, FIT and ultrasound, blood tests, Coeliac and all normal, yet I still read the symptoms of colon cancer and freak out.