Hello and thank you for posting your medical question on E health forum.
Every act of unprotected sex - does not lead to HIV infection.
First, the chances that the concerned woman was indeed HIV positive is a point to be determined.
Your symptoms do not appear to be due to HIV. Symptoms due to HIV do not present within a few days after exposure.
HIV is diagnosed based on the serological detection in the blood samples. It is not diagnosed by the presence or absence of nonspecific symptoms.
For proper diagnosis of your current symptoms, you might consult a doctor, who can advise you accordingly.
Since you had used a condom, the risk of infection is less.
For people who think they may have been exposed to HIV, having a test and receiving a negative result (which means they are not infected with HIV), can put their mind at rest.
To relieve your anxiety and for a definitive diagnosis, you might consider getting screened with HIV test. This will help you get over the past exposure and move on ahead in your life.
I hope this helps.