This shot does seem to hit them hard.
I know Gracie was just a bit off for several days after hers, too. But she was eating, although maybe not as vigorously, drinking well and somewhat playing, so I called her doctor after a few days and said she was still a little 'off'. He said to continue watching and if anything changed (diarrhea, vomiting, stop eating/drinking) to bring her right in. A few more days and she was back to her normal self. When she has to go for her booster at 1 yr, he said we could do things a little different to help her deal with it easier.
So, if you are concerned, give your doctor a call, it probably won't require you taking your baby back in. Just always good to talk to the doctor and keep them informed on what is happening.