Hi Anne, I didn't get ulcers but did experience oral thrush after my second chemo dose. It felt like I was trying to swallow over razor blades, it was so sore. I had to use Nilstat in order to clear it up and would then be right until the next chemo when it would flare up again and I would be back on the Nilstat. Eventually got to the point where I couldn't swallow anymore of that stuff so my Oncolgist had to get approval for Fungilin Lozenges and I sucked them for my remaining chemo doses. Hope you feel better soon. Karen xx