Yes Linda I had many including losingthe memory of the previous year of my life and parts of the next year, I remember nothing at all. I had to have all of my teeth removed for rads, chemo and radiation seed implants,. Was given up tpo die and was readied to be sent to an extnded care facility bu woke just in time from the induced coma I was put in. My memory of the following year is almost as bad. I still suffer much pain and will never have teeth again , but I am a survivor and will make it.