In my humble opinion, there is no room for being sorry here, so best be safe. There is nothing to lose and everything to gain by going to ER and getting the symptoms checked out.
It could just be a serious case of vasoconstriction and will die down of it's own accord, but there is no harm in finding out the cause of these and the best thing you could do right now, if you fear you have OD'd, is to get yourself to a hospital.
You have been up all night taking a stimulant known to place stress on the heart.
In my opinion, it is in the interests of harm reduction to close this thread instead of awaiting replies from mostly non-qualified internet nurses and doctors on a forum. Not to insult anybody because it is a knowledgeable lot that is around here, but we're also a responsible bunch and the most responsible thing you could do here is get yourself checked out instead of sitting in front of a computer.