I had a similar problem in February after an urban winter event rides with lots of bumps. I had complete numbness plus acute pain from the right hand to the elbow, and woke up with it in the wee hours of the morning. I got into see the doctor right away and it was diagnosed as either nerve inflammation in the elbow or the hand, and it didn't matter which, because the treatment was the same. I was prescribed a super Aleve, which is an anti-inflammatory designed for arthritis, but effective for these types of inflammation. Basically it was the dosage of an over-the-counter Aleve times four but only once a day. I was given 5 pills, but after the second pill the symptoms were gone. Not only that, a sciatica problem that had been plaguing me on and off since last August went away with the super Aleve and it hasn't returned.
Anyway, you need to see the doctor on stuff like this. Oh yeah, first thing they will ask you is if you are having chest pains or have a history of heart disease.
Darcy