Push through. Do regular deep Breathing exercises to change your body over from running on its sympathetic nervous system (fight/flight nervous system) to its parasympathetic nervous system (calm nervous system). This will help die off. When you feel this uncomfortable and horrible, you must go out for a long walk otherwise it just drives you mad how paralysed you feel. (Irrespective of how ironic I sound)
Unfortunately, the reason you are feeling this way is because the Nystatin and Coconut Oil are powerful antifungals, their job is to kill the candida cells. In doing so it releases toxins such as Acetaldehyde which makes you feel sick and depressed. Generally when you feel the die off is too extreme and you can’t cope, that is the first sign you should reduce your intake of the antifungal, find an amount which suits you and gradually increase the dosage from there.
Keep going one step at a time.