As far as liver pain and back pain I would strongly urge you to see a doctor. You really should get a check up after you stop drinking any ways. Our bodies have been put through a lot with our drinking and have lost a lot of vitamins and minerals too and so taking some B-complex helped me with my energy level and a multi vitamin can't hurt either, but PLEASE go and call your doctor. It may be nothing, but no one SR can or even could diagnose you.
Anxiety will get better when you are off the alcohol or at least it did for me. I had terrible anxiety about driving on the highways and now I do it without a problem. Also social anxiety has gotten better too. Yes, it will. Give it time.
As far as your kids are concerned good for you for giving it up. Why you did it is because you are alcoholic. You can stop it though with help. Don't start dwelling on the past right now because that's a sure destiny back to drinking in my opinion. Be grateful for today and all you do have in your life.