Have you tried getting the liquid B's complex, not the B-12. I used to be very anxious and depressed which was making me physically sick too. A doctor recommended me to take these, it takes about three months for you to realize that your anxieties and depression are less, and before I knew I have been heal from it all, thanks God! I still take them faithfully after a meal, don't want to go back there ever again. There may be some other kind of deficiency in your body like a vitamin or mineral, but not prescribed drugs. They tried that on me too and it was making me worse and the side affects are so bad.
Father in heaven help this child of yours be able to be free from anxieties so they can have a normal healthy life like you intended us to have. Help them also be able to have good relationships with friends and coworkers, to be able to meet good Christian people who will lift then up spiritually and in prayers too. In Jesus loving name I pray amen.