Sounds like withdraws from smoking if it subsides when you have a cigarette. There's a lot in cigarettes besides just nicotine.
swedishfish is correct in stating this. I have withdraw symptoms the first week but then they slowly started to subside. Being jittery was one of them. Not sleeping as much was the other. I still don't sleep for more than 6 hours where I used to sleep 8-10. However, the loss in sleep never bothered me...I didn't feel tired at all. I still had plenty of energy.
Try not vaping and just smoking for a day and see if it goes away. Then you'll know for sure if it is cigarette related or not. If it doesn't, please see your doctor and tell him/her what is going on.
Edit: I should have kept reading more into the post before posting this. I'm glad to hear that your symptoms went away.
