No your fine. It can take up to two weeks to feel "normal" again. Of course if you really did coke then your mouth and throat should have gone numb when you tried it and you should have a stuffed up nose right now. You didn't mention these things. So if you didn't experience these things you probably didn't do coke. The effects of coke wear off after a few hours with a stuffed up nose following it for about one to two weeks.
Pressure on your chest and paranoia
point more towards crystal meth
, which can be snorted the same as coke in a powder form. Which is also going to be fine just takes like a week to get over. The effects of meth wear off after about three days followed by chest pains and paranoia generally for about a week.