It is highly possible the cocaine you had was of very poor quality. I.e containing some horrible cuts, and possibly even some other active ingredients like amphetamine or some other shitty stimulant.
This effects are not abnormal, but I am surprised they would still be effecting you three days later and you only did a few lines.
Have you had anxiety issues in the past? If you are taking valium to combat it and you are still having issues, it is hard to say what the deal is.. Unfortunately we cannot accurately diagnose you via the internet.
If these symptoms continue to persist, or get worse, I would highly suggest going to the doctor jsut to make sure everything is alright. you don't necessarily have to say you were using cocaine. But they can do a few simple tests, to see if it is something other than simple anxiety problems.
I would be very surprised if it were anythign serious, but it cannot hurt to get it checked out.
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Personally, due to my extensive stimulant use when I was younger I have very horrible anxiety/insomnia/RLS problems now due to it and without benzos/neurontin I cannot function.
Bottom line - see if the symptoms continue and if it is still worrying you, please go to the doctor.[/QU
This is probably the most likely in my not ever using cocaine opinion. Unless someone else experienced identical symptoms then you are going to have to wonder.. is it possible to get a second opinion from a friend that was with you. You said you only did a few lines. Who cut them up for you. Do you have any way to describe the amount you did. Was it your bag or someone elses? If all the info you have is you did a few lines of something you never did before I hope you can see how we cant tell you anything. As much as some would like to help..