I've had two panick attacks where I've had full body tremors is this dangerous?

Tremors with panic. As long it was not a seizure, there is probably no danger per se. Shaking & trembling is common in panic attacks. A well validated treatment 4 panic attacks is exposure therapy, where, w/ therapist's help, u intentionally bring on the physical symptoms of panic, alternating w/ relaxation techniques. Over time you can feel the initial sensations of what would have become a pa but not have one.
Panic attacks. Panic attacks can happen for several reasons, both physical or psychological. Either way these can be prevented with medication. Please discuss with your pcp.