Sounds like either a chemical pregnancy or the lab made a mistake. You being sick could not have 'raised' your hcg level, if your not pregnant your hcg level is 0, the only thing that can get the number higher is pregnancy.
Did you ask the doctor?
The doctor replied that they did not understand. What happened.....
well thats not helpful of them. i would still think that it was a mistake or a chemical pregnancy. if you want more info you could ask your doctor, their should be notes in your file