Can your rapid ELISA test come back reactive if you had mononucleosis 6 months ago?

Six months ago I had unprotected with a male. Two weeks later I got chills, a fever, swollen lymph nodes, and headaches. To say the least I thought I had strep throat. Come to find out after visiting my doctor I had mononucleosis. After researching the disease I have found out that mono and HIV have the same exact symptoms. Just recently I tested reactive on my rapid ELISA test. I am now waiting for my confirmatory results and I am a wreck. I'm so nervous. Is it possible that my mono and my recent dose of the swine flu vaccine contributed to the reactive state? Or is my outlook grim?