How To Cure The Pain In Vagina Caused By Masturbation With A Banana?

Had some bleeding after trying to masterbate with a banana. My. Vaginal opening is quite small im 49, post menopausal for 5-6 years. Insertion was painful, figured this was just a "pleasure/pain" response. Perhaps not so much. After reading multiple pages on the web I've decided the answer that made the most sense was that I likely tore some vaginal tissue perhaps some part of my internal labia. Now that I've completely incorrectly misdiagnosed myself, could you perhaps help me?