Hey julbug, I started vaping mid June and felt tired,happy,sad,dehydrated,grouchy,hungry,mad you name it.
However my body was/is adjusting from camels 2 pack a day
35 yrs to just 1 or 2 a day!
Don't sweat it every day gets a little better!
I still smoke 1 or 2 analogs a day - when enough time passes and my body/mind are ready I'll be done with analogs.
It's a victory for me just getting to this level.
Time is your friend here, just keep vaping and reading and learning.
Try adjusting your nic levels, and PG VG ratio.
Stay hydrated.
( climbs down from soapbox )
As a wise man once said
Be one with the vapor!