Hello,
Obviously I am not you, and we are all different, but my experience when I initially started refeeding was similar. I was backed up and thirsty all the time. For the dry mouth if it sometimes got too bad I would swish it out with some water to help a little. Otherwise usually something salty helped saliva production. For me the constipation went on for around 2 months and not a month later Im pooping like a champion. I rarely ever get the dry mouth now too. I only get it if I drink water, I mostly drink soda and milk for now until things settle even more.
Best wishes!