Sick,sick,sick.... :(?

I'm 12 going on 13 and for the past couple of months I've felt really not good.I don't know what is with me... I went to the doctor and she took my blood and tested me for mono, and strep throat. I feel tired and feverish, I have headaches and a sore throat (at times) Mainly the headaches and the achy tired feeling. I've had an on and off fever for a couple of months.People always nag me about my diet, I don't eat alot of meat, I don't eat alot plainly. Now I'm wondering could these be signs of nutrition deficiencies? My mom isn't able to cook us dinner so we just eat whatever. I'm not wasting away or anything, I'm a very sturdy girl, but I'm pale and my face is always flushed.Any Ideas? I'm not overweight or anything and I run about 30 min. a week (big time i know j/k) I walk around every day and stuff. But my energy is gone. It could be emotional , things haven't been going too great lately but I think that would only cover the tiredness... Any ideas?