Awesome. Thanks so much for the advice. I am definitely staying hydrated. Not the problem. I think it may be too much nicotine. Today I was without my e cig for about five hours and was completely steady. Half an hour into puffing my e cig I was shaking. I have a really awesome brick and mortar store so I'm gonna grab an 18 or 20 mg bottle tomorrow. Hopefully it's enough to satisfy the cravings without making me shake.
The shaking may be your body coming off the cigs - there's an article on ECF that lists all the things that happen when detoxing from cigarettes. Turns out it's all the other chemicals in them that your body was used to.
Or, as you guessed, it could be the nicotine, and you're just getting too much. Simplest remedy for new vapers - buy a bottle of 24, a bottle of 18, a bottle of 12 and a bottle of 6. It's cheaper than a carton of smokes, so just do it.
Now test it out - try pure 24 and see how your body reacts.
1) Does it take away your cig craving completely? If yes, it's high enough.
2) Does it make you light-headed, give you headaches or trouble sleeping? If yes, it's too high.
Move to 18. Repeat the testing.
Keep going till you find what works. You can always save the higher nic juices for those moments when you are really in need of a strong jolt of nicotine. One or two puffs of really strong nic can get you over the edge during a bad craving - just be sure to go back to the lower nic juices afterward and use those for your regular or chain vaping episodes.
Also as someone mentioned, you can mix stronger with weaker once you find your perfect strength (so as not to have wasted juice). For example, I mix 6 mg with zero mg to get 3 mg. There are lots of juice mixing calculators online if you need one - just Google.
Best of luck and keep on vaping!