Hello,
Thank you for posting your query at DoctorSpring. I am sorry for the unexpected delay with respect to response.
Histenol forte is a medication that is given just for minor ailments like cold, cough n headache.
The symptoms that you describe are not really pointing towards any particular STD. The symptoms may not be related to the episode you had.
However, just to be on the safer side, you could just visit your physician who can examine your pain and check out the causes of such pain underneath the belly. He could also run a few blood tests like complete blood count, urine examination etc. Depending on the cause the pain could be treated.
You could take symptomatic treatment for headache like paracetamol.
Hope I have been able to answer your queries. Please feel free to discuss further with follow-up questions.
Take care. Regards