Worried99 - try not to panic.
The most common cause of bleeding from your bottom is piles, and these can easily be aggravated if you have a lot of diarrhoea - it could also have caused an anal fissure, again not serious. But the diarrhoea is not usual to go on for this long.
Have you recently been in hospital, visiting relatives in nursing homes, have you been taking antibiotics within the last few months? All these things are important.
Also (TMI!) is there a lot of blood or just when you wipe? Is it bright red, or darker red?
I know quite a lot about this as recently had some problems myself. I was asked to lie down and the Dr felt my abdomen, then she did a rectal examination with a gloved finger - it wasn't bad - very quick. She didn't insist on it but I wanted her to check for fissures or haemorrhoids.
I had to send off numerous samples for testing, because after the initial one tested positive for an infection I kept getting symptoms on and off for a few months. You might only need to do one or two.
It was just that - an infection - caused in my case by taking antibiotics and being in a hospital to pick up the germ.
It wasn't much fun but I am Ok now. If it is an infection you'll need to take something for it, the bleeding could be caused by it damaging your colon wall so this is important. I'm glad you have an appt tomorrow.
If you need to ask me anything else you can CAT me, happy to help if I can.
The other possible causes (not probable, just possible) are Inflammatory bowel disease (usually either Crohns or Ulcerative Colitis) or very rarely cancer - or just a polyp in the colon.
The diarrhoea could be caused by a bug (various different ones) or sometimes just stress.
So don't panic yet, but DO go to your GP tomorrow as you've arranged, or tonight if you can get an appointment to see the out of hours. the sooner you get a stool test the better as it might rule out anything nasty.
Good luck, take care x