I've Had Episodes For As Long As I Can Remember

I've had episodes for as long as I can remember where my muscles will clamp down, I stop breathing and I just have to hold that till my body says it's time to release it. It's always been hard to describe and even what I've said here doesn't seem quite right. It feels like the focus area of this tension is in my head, kind of to the back but centered. It's like this is the area that's forcing the tensing. It always forces my eyes shut and while it usually is focused only in my head (the rest of my body doesn't tense but I can't move it at all) it can spread to the rest of my body. The worst episode I can remember my entire body locked up and I couldn't move or breathe for what seemed like forever. I am fully conscious during all of this. I can hear everything, feel if someone touches me, but I can't react to it. Sometimes afterwards I feel like I'm in a dream state. I know and remember all that I'm doing but it feels like when you do things in a dream, you're doing it but it's not real. I also have random body twitches that sometimes come with these episodes but they can also come alone so I'm not sure if they're related. Its normally flinging an arm out or, more commonly, a bend or twist of my head. these twitches, if they do come with the episode happen afterwards. I've never seen a common point between these episodes either. Nothing about my life or physical or even emotional state that is ever really the same. Even with everything I've said here, I'm still not sure I'm describing it correctly. I've never seen someone else have episodes like mine so I can't even begin to understand what they are or why they happen. I guess it's my lack of ability to describe what's happening or see any link between them that has made me not seek help for them. I've actually gone a long period, may a few years, since I can really remember having an episode and then all of a sudden, they're back full force. It actually wasn't the severity of the episode but how unreal the world around me seemed afterward that really scared me into trying to find some sort of answer for this. I don't even know what type of doctor I should bring this to so I can get some sort of treatment.