Chest pain but no cough!?

I'm 22 years old and very healthy I haven't been sick in 3 1/2 years but for about 4 days I have had a tightening in my chest it kinda feels like a draft in my back but in my chest I have no cough and no fever however I do have anxiety disorder but it doesn't feel like it could be that....I'm on the Z pack for 2 days and it isn't working yet....we get a lot of heat in my apartment and I do wake up congested but my chest doesnt feel congested....I'm worrying that it's something bad and shouldn't the medicine be working by now!