What are some relaxation exercises to get over a panic/anxiety attack?

Panic: Meditation & yoga while doing breathing exercises should work.

Panic/ anxiety: If you can find a quiet place - do so. Breath in slowly & deeply through your nostrils. Fill your lungs with air (but not to the point of discomfort). Hold for a count of five then slowly begin to exhale through an open mouth. Repeat at least 12 times, longer if you need to. If you haven't been assessed for your panic/ anxiety - that would be prudent. Take care.