Crizzy,
Yes, anxiety and depression can give physical symptoms as well. Often times, we grow hyper-sensitive to the things we are worried about having. Even if, I know people with HIV and it isn't the death-sentence that it used to be. I worked in a hospital and they said that asking if a patient had Hep-C was more important. That is because HIV is not the same as it was once thought to be. It's treatable and on average shortens someone's lifespan by a smaller amount than smoking would.
Bottom line: You should be reassured that it is unlikely you've gotten it. The likelihood of your sexual partner having HIV is so low it is hard to quantify. You might have obsessive compulsive disorder, which sometimes causes people to have unrealistic fears in a way that is majorly disruptive to their sense of wellness. It might just be anxiety. You can speak with a therapist or read up on other people with similar fears, but I highly highly highly recommend speaking with a therapist. They can help ground you in reality and give you relief until you get confirmation from the testing. Hope the best for you. - Brett