@justaskin,
1. It is actually very difficult to get HIV from a single encounter. Even if you had unprotected sex (without a condom) with a HIV+ person, you are still unlikely to get the disease. What you are describing is something different. There is a possibility that you contracted the disease. Based on what you are describing
it seems very unlikely.
2. Taking an HIV test the day after a sexual encounter is useless. You need to wait a few weeks (and I think they recommend having another test 6 months after having sex just to make sure).
3. I know of no "post sex" pills for HIV. That isn't how viruses work.
4. I think the problem is your conscience.
All sex (including with a condom) comes with some risk. It is a small risk, and most of us deal with it (many of us decide not to even use a condom).
If you are going to be sexual active, you are going to have to deal with your conscience. Sex is normal and it is highly pleasurable. Is there someone with whom you can talk about this?