Use multivitamin and protein powder.Take rest

You are vaccinating to get protection from corona virus.so let's consider this way...Vaccine will help to make your immune system make enough weapons for fighting corona virus if you come across it in the future.so for during this process of making your immune system active you may get these symptoms which are normal for making the weapons. So don't worry just drink water and take paracetamol three times a day.

low grade fever after covid vaccination is  normal for 2;3 after vaccination ,, Take tab paracetamol on  sos basis. and keep yourself hydrated

These are post vaccination events which may prevail for 2-3 days.