Hello and welcome. Congratulations on your steps toward a healthier lifestyle!
One thing that will help you clear out the "brain fog" and get some of your energy back is taking a good multi vitamin. Drinking heavily on a regular basis depleats your body of a lot of necessary vitamins & minerals - B vitamins especially. A good multi and a B suppliment would be even better.
Drink plenty of water - good advise no matter what your health goals are :)
Be sure to exercise, but give your body the rest it needs, too. It takes time to heal from the damage drinking does, and resting will help.
Seek out your physician's advice to help you rebuild your body and to be on the safe side. That is a pretty good weight loss as you not a very large person it seems.
Just stay focused & know we are here whenever you want to talk. The best of luck to you.
Kitt