Very worried 59 yr old woman

Hi everyone.

i had a virtual colonoscopy about 6 weeks ago and it has showed nothing abnormal.

my symptoms are much worse than before, loads more bleeding, blood in every stool, very nausea's and last 3 days loss of appetite.

Dr said that it's probably haemorrhoids and IBS, I have had IBS for over 25 yrs and haemorrhoids for over 10 yrs and I know 100% it's neither of them, what do you think I should do if I'm not happy being left like this.

sally.