Fever

I have an almost 8 month old, she's been sick for literally weeks. I took her to the doctors Monday & yet again she has ANOTHER ear infection & a "virus" (her doctor calls everything a virus, irritating) but she will go from cold sweats to a temp of 104 within an hour, throwing up & diarrhea' super sleepy, but light sleep for short periods of time. this is by far the worst she's ever been. What temp do you consider dangerous & any ideas of what could be going on??

104 in an infant is very dangerous. 104 can cause brain damage & seizures   I would have been at the hospital a long time ago if she's been sick like this for weeks....