Yes, it will get better.
The first week is the hardest, at least it was for me. But give yourself another week and you should be feeling lots better. If you're still feeling crappy, see your doctor, please, to be safe.
Welcome to the family! I finally gave it up for good over a year ago and it's been the best year ever. (well, after the first couple months of ups and downs, anyway
) You won't regret giving it up, I promise.