It seems like you may be having Pelvic Inflammatory Disease
(PID). Your symptoms suggest it.
You require a course of antibiotics like Doxycycline and metronidazole
along with a third generation Cephalosporin
Prior to this, it is better to get a vaginal swab culture done.
If your periods are delayed by more than a week, do a home pregnancy
test to know if you are pregnant or not.
Until all these, you should practice safe sex with condoms as both of you may be infected.
I wish you speedy recovery.