Hello
I share your concern.
Swollen red itchy and red vagina might be caused by infection or inflammation of the vagina or urogenital tract.
I would advise you for a battery of investigation like CBC,
ESR,
liver function test, blood sugar, Urine culture and sensitivity test, vaginal swab culture as well as
ultrasound lower abdomen and pelvis.
You may require a course of antibiotics under medical supervision.
Meanwhile maintain good hygiene,take hot water bath.
try to be gentle during sexual intercourse and ask your partner to use condom next time.
Have lots of fluids which will help by
flushing off the urogenital tract.
Hope this answers your question please feel free to ask for further clarification I will gladly answer you.
Best wishes