Hello and welcome to HCM
Since you had a sexual contact with a sex worker (High risk behaviour) there is a possibility of contracting HIV
only if the other person has HIV.
The best possible way out is to get the HIV status of the other done if possible. If not get your test done after a period of four week.
Besides HIV there is also a risk of contracting other sexuallt transmitted diseases, Be cautious about them too.
The symptoms that you have mentioned are not charateristic of HIV infection.
Muscle spasms and body aches point tpwards a viral etiology. Take rest and see if you recover in few days. If not visit your physician.
Dr Shailja P Wahal