Hello I had gone through your question and I can understand your concern very well This could be due to 1. inflammation or allergic reaction following application of organic gel tightener and injury during sex 2. STI or UTI You need to see a gynaecologist for per vaginal examination and a battery of tests like blood profile and urine culture meanwhile you should have plenty of fluids to flush off the genitourinary tract you can take ibuprofen and levocetirizine (anti allergic drug ) Hot water bath will definitely help you Avoid sex until it heals completely Multivitamin supplements Maintain good hygiene best wishes