Last night my 15 year old teenage daughter started to feel a little weak and had a headache and would black out for a few seconds along with feeling like she was walking on a slant and felt like she was going to fall. Today she still feels that way but now she has a fever that started at 101 and after taking Tylenol it still went up to 102. After taking another Tylenol her fever went up a little more to 102.3 and she says her head hurts really bad and especially when she has to move it at all. I don't want to just run to the doctor if its something that will run its course but then I don't want to put it off if it could be something serious.