I had it before it had a name, too. It lasted 4-5 months and then just went away on its own.
Miserable feeling. I started taking a Benadryl to allow me to sleep, and went to the spare bedroom to sleep so DH could get his rest. I paced at night until I discovered the Benadryl trick, and it helped with the allergies too!
If you've been drinking coffee for years on end I can't see it would make a difference in such a sudden way.