Can I Please Get some Advice???????

Last night I was really nervous and woke up in the middle of the night (1AM) with rapid heart rate, breathing, shaking, and nasea. I felt so nervous but was luckily able to fall back asleep till about 5 AM. I felt pretty good all day, but then at the end of the day my I had to take a test and got extremely nervous. My body tensed up and I kept having to cough, and broke out with a rash. Now my throat still feels congested and the top of my mouth towards the back feels rough. I think it may have been panic, but i'm not sure I thought it could be seasonal allergies or anxiety, but who knows? I don't want to die!! What is this?