Vaginal vault brachytherapy after effects

Hi, had four sessions of vaginal vault brachytherapy following a full hysterectomy because of  endometrial cancer.  Just had a six week check up following the radiotherapy and was expecting to be discharged as I am feeling really well and scans have come back clear.  However, the doctor said he had found an ulcer following an internal examination and wanted to see me in six weeks time to make sure it had cleared up.  Has anyone else had that problem?  The doctor thought it was not anything to be worried about and I had not fully recovered from the radiotherapy but of course my mind is working overtime now!  Be interested in hearing from anyone else who has had this problem.  Many thanks.