Homeopathy is one way to go. The founder of homeopathy actually founded some of the earliest mental hospitals where he claimed cures of some cases of bipolar (I think schizophrenia too). Ayurveda and chinese medicine would suggest rebalancing the body. Regarding the crackling you are hearing, the human skull as various points where cranial plates and joints meet up. They do actually move around all the time, and when you are going to bed it would be one of those times because of the pressure on your head. They are the theory behind craniosacral therapy. It is interesting they just discovered something called the interstitium which allows for fluid to circulate around the whole body, so it remains to be seen what Science will conclude about supposed alternative health and the way the cranial plates move around as well as theory behind ancient healing arts. It may be the explanation for things such as Morgellons and schizophrenia, where people claim to feel things crawling on them. Put your mind at ease. If you still believe they are parasites, don't worry there is a cure for anything. Seek and ye shall find and that includes schizophrenia. As long as you don't have any symptoms of liver disease, your liver is probably fine, just don't exceed max doses of vitamins and if you have unexplained sickness that pops up stop taking your supplements immediately.