Hi,
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Your symptoms (inflammation, itching, pain, discomfort with intercourse, fishy smell) are suggestive of vaginal infection. An examination done along with a vaginal swab/smear test will help to identify the causative agent. Visit your doctor/gynecologist at the earliest for further evaluation. Get started on treatment as indicated (by examination and investigation results). Drink plenty of water. Since you are sexually active, get your partner also treated simultaneously to prevent chances of re-infection. Avoid vaginal douching, use of harsh soap or perfumes in the area. Use loose cotton undergarments and avoid tight fitting clothes. Avoid having unprotected intercourse while both of you are on treatment course.
Take care.