I'll give an unscientific response Bobby and it's only my own unprofessional opinion. But I do have a little experience.
First, if the test was only expired two months, I'd say the result was likely accurate anyway. The anonymous screening would be your backup and I'd suggest you do it if only to ease your mind.
Secondly, as one of my favorite docs told me several years ago - though I don't know if I necessarily agree - some of us really have to work at getting HIV.
Third, symptoms come from your body's immune response to the HIV. It may be fever, fatigue, swollen lymph glands. But Google your own research from reputable sites.
I'll go back to #1. Just do the anonymous testing and, to quote "Hitchhiker's Guide"...Don't Panic.