Nothing stranger than your bowel habits changing

Hi, I'm avoiding google but worked on surgery ward mainly for bowel resection for 2 years so getting slightly paranoid!

November time, I started to fell tired more than usal, bp all over the place, usal tests done, all ok bar when passing a motion, I was in agony, I usally go twice to 3 times a week, I'm not constipated this is usal for me.

I noticed end of December blood in my stool and toilet but I'd passed a huge motion (sorry) so put it down to that and slight leakage after, saw my gp, he said piles, no examination given, I had noticed a slight, i think skin tag, maybe pile on my anus but again not looking it up!! This I've had for a while but it's gotten bigger, I say a while, 6 months or so.

Now the past 2 weeks, I've a lot of green creamy discharge over my stool with bloody streaks, lower left abdo pain which is a nagging one and gets worse  when I eat, gas is like the next wind storm Ciara and i cant eat.

My motions are now 4/6 times a day still with mucus and the blood I've noticed is more apparent when I eat and theres a smell too to the blood and that's gone darker! Today I've not eaten, as no appetite, so I'm waiting to be fast tracked for a colonoscopy but getting worried as symptoms seem to be getting worse bar vomiting. Also I feel like a like I've not emptied my bowel completely and gotten lower back ache too.

I'm just feeling blah atm and so tired. 

Is there any supplement I can take of sorts until I get a diagnosis.