Sassycat- like many here said, everyone is different and comes off the cigs different. These are my first days starting 20 days ago. I'm a nwebie like you, not an expert by any means. This is just my story and maybe it will help you out a bit.
Was a light smoker of full flavor smooths. Tested the waters the last week of January this year with a few njoy king free samples while still smoking my last pack. Surprisingly that pack I bought last all that final week with supplementing with the njoys. Ordered a 510 with cartos and 24 mg juice. It all arrived Jan 31st so I decided that my quit date would be the next day Feb 1st - an easy date for me to remember.
The very first day was fine, no analog cravings at all and I was becoming friends with my 510.
The second day still no physical cravings, but the mental habits were difficult to stave off. I found that I enjoyed going outside for a cig because it was also a 5 min break from the kids. I love them dearly, but as every parent knows, sometimes a mental health break is required. So I started going outside and vaping instead of in the bathroom (I still don't feel right vaping where the kids can see me) and that "cured" my mental urge to smoke.
Third day was horrid. I got the headache, sweats, shakes, abdominal pain, etc. I thought at first I vaped too much nic, so I took a nap. I woke up feeling better so I was still thinking maybe too much nic from vaping. The next day same thing but less so. Each day it was a bit better with no change in vape amt. It lasted about a week with each day a little better. Now I know it was my body withdrawing from the analogs, not too much nic, because I didn't cut down on the vaping or mg/ml.
I'm on day 20 and all is fine. Still no physical cravings and only an occasional mental wish - but those have been quickly nixed. Going outside in a blizzard, single deg weather, and another blizzard pretty much killed my want of going outside, lol. I'm down to 18 mg now and when these are used up I plan on going to 12. I may even buy some 6mg of the same flavors and make my own 12 mg.
I'm hoping to be vaping nic free by summer.
It's hard to say whether you are getting too much nic, not enough nic or withdrawing from other chems in the analogs. Only you will be able to figure that out since everyone's bodies react differently. Just remember to stay hydrated because it does dry you out. I'm not gonna tell you to drink gobs of water, because I'm not a water lover myself so that would be hypocritical. Vaping has gotten me to drink more water than normal though.