Hello, this is Dr K.. Answers are not medical advice and do not constitute a doctor/patient relationship. I look forward to helping you today.
Yes you need to tell your Dr the source of the injury. You must have a tetanus shot as soon as possible!
There is also possibility of perforation of the vagina. You may need an exam under anesthesia to determine this and surgical debridement. This is removal of any dead or diseased tissue. This sort of thing may also lead to pelvic infection. It would be advised to have a course of intravenous antibiotics. You would need to be hospitalized for this
Do NOT use a tampon