Struggling with NES and Seeking Advice

I don't quite understand NES. Moreover I don't know how to prevent them, even though I talk to a therapist. Over stimulation (positive or negative) triggers them. I start feeling lightheaded, then disoriented, I start to zone out, my eyes flutter and then BAM black out. Best way I describe it is like a computer rebooting, like a really old computer rebooting. Then when someone snaps me out of it (mainly by pinching because it's the only thing that works 1/2 the time), I can't really describe it. It's almost like I can't comprehend time and space. My boyfriend tries to overload my brain til I fall into another episode, then snaps me out of that and usually my memories gradually come back. It affects me working because it can get stressful and that's when it can get dangerous. I can only take showers if my boyfriend or mom or sister is around, because after I shower I tend to have an episode. I wish I knew what to do. Hopefully I'm not the only one who feels these feelings. I don't know who I am anymore.