I have constantly had a fever on and off, its usually low grade though. I keep getting this fever, but other than that I feel fine. Ive been trying to see if anything causes it, and one time I noticed it didnt start until i got up and ate a light snack. But It was the only time I noticed. My heart will beat faster than normal occasionally but I havent been able to see if it accompanied the fever. Ive also had shortness of breath a few times, but thats it. I have a very bad immune system from Osteogenisis Imperfecta by the way. Any diagnosis?