Can Fumes Of Cleaner From Heated Oven Cause Any Problem?

My mother left oven cleaner in the oven and neglected to tell me. I heated up a sandwich in the oven at 350 degrees F for about 15 minutes. I ate half of the sandwich and was exposed to the fumes in the kitchen. I feel fine, and this was about 20 minutes ago. I drank some milk to offset any alkalinity from the cleaner. What should I do now? I really do not want to have to go to the ER. I feel fine except for a slight headache.