How bad is the starting pain?

I’m going to start next week but I’m a little worried because I have chronic migraines almost all the time. Either braces or Invisalign, I know it’s going to hurt the first week at least but is it going to be insufferable? I can’t imagine having a migraine while my whole jaw hurts.

I just want to start preparing if I need to do or get stuff in advance to ease pain or if it’s not as bad as I’m thinking