Ever had occasion to take nitroglycerine, or absorb any through your skin?
It dilates the blood vessels, that can cause flushing, violent headache and weakness/dizziness. Some people get heart palpitations.
If I had just handled a suspected terrorist device and suddenly developed those symptoms, I'd assume I'd been poisoned!
No, never been around nitroglycerine. Thanks for explaining the side effects, I had no idea.