Thanks for query.
This could be an STD.
Also as you had past history of chlamydial infections hence there are chances of recurrence this time.
Some of the other possibilities are
1.Sexually transmitted disease
(STDs) -genital herpes
, genital warts, trichomoniasis, and gonorrhea.
2.Yeast infection (vaginal candidiasis
Visit to a gynecologist for clinical examination,lab tests and treatment accordingly.
Hope this helps you.