Hi and welcome to HCM.
I suggest you not to ignore those symptoms.Dont need to be concerned,but take some time and do tests step by step to rule out something serious. You will feel and sleep better knowing that you are helathy. If you are older than 55 the risk of all these cancers youu ve mentioned is increased. especially if have genetic predispositions. So first colonoscopy
should be done at 50,and next one in 10 years,but every year should digitrectal exam be performed. You should now start with gastroscopy and stomach biopsy
to see is there helicobacter infection
and plan further tests after that. Of course, alchohol and smoking