I know you worry about pain management at surgery. But in the text book, we are using the same amount of anesthetics for epidural anesthesia. I can't say the exact amount of anesthetics, because we don't know actual anesthetics which is going to be used. But in the case of the dentist, usually, they are using a low dose of local anesthesia so that it may be low effective for the pain at that time. In the process of epidural anesthesia, we put the anesthetic tube into the epidural after the first injection. Before doing surgery, we confirm the effect of anesthetics using pin prick or something. If you still have pain, we can inject additional anesthetics through that anesthetic tube.
Don't worry. I hope you get to feel better soon.