Thank you very much for your replies!
I know it's impossible to diagnose over symptoms, but I guess I just wanted to share my story and hear other people, since I don't really have anyone offline to talk about this.
Just a quick update. Today I feel a lot better. The only thing is that my Asthma kicked in [it always does when it's a regular cold or flu], so my chest feels very tight. But my sore throat is about 95% gone.
My friend was tested negative in May, and said he would re-test this week. I know not to rely on that, but it will make me feel slightly better [or give me a mini heart attack if it's positive] until I can take the test myself.
Anyways, thank you all for listening and replying.