I'm sorry your dad is not being supportive of a means of intervention that could help you to get better.
Why is he launching into "negative and condescending screaming fits" over the fact that you take antidepressants? Does he not believe that they are actually helping you and/or believe that they’re having negative side effects that outweigh their benefits?
If you are not willing or able to restart your meds, you should at least let your doctor(s) know that you have stopped taking them so they’ll be better prepared in case anything serious happens. You should also tell you doctor that your dad’s behavior is what has caused you to discontinue. It might be helpful to have your doctor speak to your dad about this.
Ceasing to take anything without tapering off the dose can be physiologically dangerous, even before considering the psychological effects of sudden discontinuation.
You’ve probably read about this before but just in case:
http://www.webmd.com/depression/feat...k-time-to-quit
^ The above article notes that the NIMH advises patients take antidepressants for 6 to 12 months even if one feels like they want to quit, in order to give the drug time to affect neurological processes as well as possible.
See also:
http://en.wikipedia.org/wiki/Antidep...rawal_symptoms
http://en.wikipedia.org/wiki/SSRI_di...ation_syndrome