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Feeling of pressure and swelling between Vagina and rectum indicates that you might be having problem with Pouch of Douglas. This is a fold of peritoneum
between Vagina and Rectum. There could be collection of fluid, pus or blood, due to several reasons like Infection of Pelvic organ ( Uterus, tubes, ovaries), Endometriosis
, Ectopic pregnancy
. There could be congestion due to excessive blood flow ( Pelvic congestion Syndrome
). There is a possibility that you have prolapse of Posterior vaginal wall there. Rarely there could be Fibroid
also. All these are Medical terminology, and you will not understand it, so I would suggest you to go to Gynecologist. Your Doctor will advise you depending on your clinical history , other related symptoms, and will do management for the same. If you wish to have more information from us, you may give some more details about you.