Is it serious issue? Very panicked.

I am 25 years old, unmarried. I never had intercourse. I am suffering from right sided pelvic pain since 3 months. The pain also radiates to my lower back and leg. Gone to multiple doctors, done tests like USG,ct,mri,cbc,esr,tsh,urine culture. But my doctor didn't find anything abnormal. So my symptoms remain undiagnosed. I have taken multiple antibiotics in this duration and 2 cycles of oral contraceptive pills. But I still get pain. Along with pain I also used to get yellowish discharge with traces of blood. When I took the oral contraceptive pills,the blood tinged discharge was not there. I stopped taking pills from last cycle. After stopping pills I got my periods on 7th sep, but from around 9th day I again started getting yellowish discharge with blood traces. I am still getting the discharge with traces of blood. I am really scared. I need help. I had to ask this here as I my appointment with gynaecologist is scheduled on Tuesday and I am feeling very panicked.