Hi
I can see why you may be concerned over what happened. It’s common for people to think every possible way that something may happen. With what we know about HIV and other infections in the blood this would not be a good way for them to pass from a dried up cut. But let’s just say worse case there was some fresh blood that went into your anus. In this situation there would be a chance that something could pass.
As this is bothering you I would suggest going for a blood test for HIV and hepatitis B and C in 6 weeks and then a final test at 3 months. We find most things would show up in a test at 6 weeks but recommend 3 months just to make sure. If you have no immunity to hepatitis B it would be good to get the vaccine.
The symptoms you describe can be caused by many different conditions so cannot be used to diagnose an infection, but I can see why they would make you worried if your concerned about what happened. The best thing is to go off your blood test results as they are the only way to see if anything was passed to you.
Let us know if this does not answer your question or if you have any other questions or concerns.
Health Nurse