Heather
When i was younger, i had mono, just like you i seemed healthy except my voice. finally one Dr. sent me for bloodtests and it was confirmed i had mono. I just didn't have all the symptoms at once, so it was hard for the other drs to tell. did the drs. give you any medication? If so The only advice i can give you is take the med. and get as much rest as possible.(even if you dont feel tired all the time.) it took about 6mons of doctoring for me to finally find out what was wrong. and by that time i had sores in my mouth, and couldn't eat. I was about 16 at the time and was down to a little under 100 lbs. If there is anything else i can help you with feel free to ask.Heather