I only actually have periods once every six months or so (The longest I have gone without one was a year), and trust me, I'm not complaining.
But I still PMS regularly, and very bad. It messes up my SPD, and causes me to have terrible mood swings(To the point I often won't go to school), and even manic and depressive episodes, it's like I'm bipolar but only during pms. A whole ton of weird stuff happens during PMS.
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Diagnosed autistic level 2, ODD, anxiety, dyspraxic, essential tremors, depression (Doubted), CAPD, hyper mobility syndrome
Suspected; PTSD (Treated, as my counselor did notice), possible PCOS, PMDD, Learning disabilities (Sure of it, unknown what they are), possibly something wrong with immune system (Sick about as much as I'm not) Possible EDS- hyper mobility type (Will be getting tested, suggested by doctor) dysautonomia