Endometriosis- Painful sex?

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I've been diagnosed going on 8 years now so you would think nothing would surprise me anymore. but I'm curious because this happens so infrequently I can't find any other explination for it. once in a blue moon I'll get these pains while having sex that feels like im having sex with knives and I can feel it all the way up into my abdomen. absolutely nothing helps and I have to just wait for it to pass. my fiance is pretty freaked out when it happens and never knows what to do. I've read pain during intercourse is a common symptom for endo but curious who else has experienced this and what helps for you?