DeViL dRiVeR 76 . . . welcome to the Forum.
From your description it appears your parents were converts when you were young? You also mentioned that your father is very paranoid and hears voices? This sounds very much like he too suffers from a mental illness. The conversion process has the potential to be very damaging. While I don't want to offer unwarranted excuses for abusive behavior, if you haven't already done so, you will find it very therapeutic to understand just why your family life was such an ordeal. This video interview about mental illness among JW's is well worth your time.
http://www.freeminds.org/psychology/mind-control/jehovah-s-witnesses-and-mental-illness-by-dr.-jerry-bergman.html
It runs for an hour so give yourself time to view it. It will help in understanding your own personal trials and tribulations as well. The rest of the freeminds site is very helpful also (but you probably know this already?). I personally suffered a mental health problem after 26 years in the cult. This has taken several years to gain control over, but I'm in a very much better place now and enjoying life to the full.
The WT experience is damaging on many fronts and many here have had similar struggles. You will find much support and understanding as a result. Something we have drummed into us in WT world is an inherent mistrust of Medical Practitioners . . . nowhere moreso than in the area of mental health. Put this mistrust behind you for there is much to be gained from availing yourself of modern treatments. Do not be overly anxious about medication. There is more risk in avoiding it's appropriate use, than in allowing it to perform it's function. It doesn't mean lifelong dependency . . . I am now medication free, but it has taken about 6 years.
Counselling is also very helpful. It's not the mind-bending magic show that WT would have us believe. You can be helped to gain knowledge of why things are the way they are, as well as effective coping strategies.
Feel free to PM me if you have any questions about the things covered here and continue to research matters. Talk frankly and openly to those in the Medical Profession about your feelings on your treatment . . . they will be happy to make adjustments. Adjusting your treatment will be an ongoing feature as you make progress.
Aren't you glad the entrapment is over? . . . believe me, life will get a lot better for you from here on . . . you have much to enjoy and look forward to.
All the best in the days ahead.