What's wrong with me? Plzzz help!?

I've been really sick lately. Bad, sharp pains below my ribs on the left side, headaches, weird red dots under my skin, i've been bruising really easily, not hungry, extremely tired, swollen lumps in my throat that don't hurt, lots of pains in my joints, and i get tons of sinus infections(4 in 9 months, one was so bad they had to run a cat scan). What's wrong with me?! ..these symptoms have been happening for over a month at least. ...any ideas??