When I'm having sex with someone and I achieve orgasm, I tend to go in these seizure-like fits. The person has to hold me down and coach me through it. It's very painful afterwards and I can't control it. My head and neck tense up while my arms and legs flail (sometimes violently). Being a polysexual, it's the same with guys and girls, but only noticeably started after I began a relationship with my now boyfriend of 3 years. Sometimes my body just loses feeling and drops (sometimes blackout too).

Does anyone know what this is? My doctor told me it had something to do with my blood pressure dropping and skyrocketing but jeez that's a little much, eh?