I had J&J and felt horrible from hour 10 to hour 30 post vaccination, but then had a horrendous headache through day 6! From what I read, the thought is to give it a week post vaccination before calling the doctor (sounds insane to me)! I would say if you are stilling feeling awful tomorrow to call. You did the RIGHT thing and your DC will be okay. My teen felt "off" from about hour 6 to hour 24 post 1st shot and did not feel great the day after the second (with a slight fever).

It is so hard to feel horrible after something that is supposed to make you feel better!