Hi,
Noted your history about your girlfriend, had protected sex 15 days ago and now she has developed headache, leg pains and weakness.
This probably is due to one of the following reasons: in view of short history that you have provided:
Some sort of infection, usually can be UTI that is common after sex.
Can be
anxiety and
stress.
Hence I would advise her the following:
Better to consult a Doctor to have clinical evaluation, examination and investigations as needed like Tests of urine, blood.
Ultrasonography of abdomen if there is clinical UTI and as advised.
She may need a course of an antibiotic if there is any evidence of an infection.
Till then give her
Paracetamol, plenty of oral fluids, symptomatic and supportive therapy.
Hope I have answered your query. Let me know if I can assist you further.
Regards,
Dr. T Chandrakant, ENT & General Surgeon