welcome to HealthcareMagic
The first question is whether you had exposure to HIV
positive person ;blood or any such products like infected syringe needle which is causing concern in your mind.
Remember HIV is a infection which spreads by transmission due to unprotected sex with a person who has developed infection;with HIV contaminated blood or blood product transfusion; using infected syringe needle etc.Also the onset of HIV is very slow and takes few years to develop so i guess no need to worry.Presently what you are having may be just a general weakness for which take multivitamins and calcium tablets and you should be fine .In case you get high grade fever
consult a doctor for treatment.