Hi, I Haven Been Getting Sick Since Around Christmas. The

hi, i haven been getting sick since around christmas. the viruses have varied from flu symptoms to mono symptoms and strep throat. i have been to 2 different doctors and they can not figure out why i keep getting sick. Right now my throat is very swollen and hurts to swallow. i also get very drowsy. Also i am experiencing back pains. please help let me know what is going on!