i had one time unprotected sex abt 15 months ago with a commercial sex worker...it lasted for abt 20-25mins cuz i was not able to ejaculate...i used to get erect but then would get normal in a while and she would try makin it erect again and putting it in...tht happened 3 times...so eventually we stopped...she said she did not have hiv...now last month i went to a blood bank to donate blood...they did screening of the blood for hiv/aids, hepatitis and all and i was told that all those tests were negative...i dont knw if their results were accurate...i havent had any symptoms...just lost weight of about 6-7pounds in 3 months...and i did get fever abt one month after exposure but the doctor said it was because i have tonsils which ive had for the past 5-6yrs...do i have a possible risk of getting infected...plz help