Thanks guys, I've taken a bit of all of your advice. I calmed down stopped pressuring myself and just all together relaxed. Anyway what I did was I used Audacity, slowed the tempo similar to what riff repeater does and I played along with some tabs. After 2 plays I nailed the song. Im not sure what my problem was, but I really thank you guys for the help/ support. All I can say to anyone else in the situation is to calm down and not frustrate yourself like I was doing, because playing along with a song from memory is one of the most satisfying things I have done in my entire life.