Anxiety, dizziness occurred immediately after 2nd vaccination (Boostrix) as the needle was retracted. He was advised to take a sip of his water, which he did After drinking some water, he immediately rolled his head back and started to have leg jerking movements, such as a seizure event. This lasted about 5 seconds and we immediately called 911. He gained consciousness within a few seconds. He sat and elevated his feet, but he did not recall any of the events after the vaccine for about 2 minutes. He was very pale so we offered more water and chocolate and cookies EMT took over after about 5 minutes.