Oh no, its the withdrawal. Its pretty common to have horrible nightmares, anxiety, sweats, shakes, and even hallucinations when detoxing. It takes a while too, as you have damaged your brain and nervous system. They can heal, but it takes some time for the body to level all you chemicals out. There is also something called PAWS which is super fun and lasts up to a year or so. Google it. Its not scary, you can do this. Everyday you dont touch alcohol, is a day your body works towards getting back to feeling good and being healthy.