New and Needs Help

I,m 15, and about 4 years ago i had bronchitis and because of that i then got post viral fatigue, i got better after that then i started feeling exhausted all the time. The doctor told me it could be CFS but that he' s not positive about whether it is or not because CFS is so hard to diagnose. Since then it has come back more frequently and now it is almost constant.

Do i really have CFS? could someone please tell me about my symptoms...

* exhaustion
* dizziness when i stand up from sitting
* stomach problems ( getting sore stomachs often)

If anyone has any suggestions on what is wrong with me or what i can do, please help.