Based on feedback from my customers, this is normal, especially when it is your first time taking Hamer Candy. Therefore, there should not be any reasons to be concerned.
Please observe the following:
Drink lots of plain water or fruit juice
If you may feel some discomfort (this may happen, though it differs from one individual to another), take some rest.
All discomforts typically disappear after few days once your body adjusted itself.
I also strongly recommend you to read Healing-Crisis-How-to-Easily-Handle-for-Hamer-First-Timers.