Well, it's embarrassing. I've tried improvising an anal douche. I didn't realise that the tube that I inserted was a bit sharp. I only inserted a few ml of water, than I let it go back out. It went out red. I got really scared. I can only assume I cut myself on the inside with the sharp tube I used. The water pressure was very very small so I expect this wasn't a problem. The blood doesn't get out if I don't go to the toilet. It's been 1 hour, I just went to the toilet again, I was able to poo and it was mostly clear, with some red hints. Should I wait? Should it heal by itself? I'm just afraid not to bleed on the inside, although the last time I went to the toilet it was better. I guess it's too late to say I'm never going to try this again.