If you have cancer or any other health problem beyond the garden variety benign butt problems most of us get at one point or another, I will literally eat my hat. I don't own a hat, so I will go out, buy a hat,videotape myself eating it and post it on youtube for everyone to see.
That is how sure I am that there is nothing wrong with you beyond horrible anxiety.
Stop googling. I don't know what you think it's going to accomplish, but all it's going to do is make you feel worse. Stop inspecting your asshole and what comes out of it. Nothing is going to change in the next day or two. Even if you can't enjoy your weekend, stop actively making it worse for yourself.
Are you taking zoloft? If you haven't started, start already. If you have, keep taking it.
You're going to get through this and then you're going to find a therapist who can help you, as you'll have a clean bill of health and can move ahead with a clear mind.