Hello, I have gone through your query and understood the concern. The retained tampon has caused vaginal/cervical infection and possibly the infection may have ascended up into the uterus and appendages as well. Your symptoms are due to the associated pelvic congestion. However, with proper antibiotic and genital care, everything should settle down soon. Fertility is not essentially affected unless there is a tubal block, which seems unlikely. Urinary infection also should be ruled out simultaneously as it is a frequent coexistence. Do not douche or use strong soap solutions to clean the genital area. Use lukewarm water and mild antiseptic lotion. Avoid tampons and use sanitary pads in future. Hope this helps.