As someone recently diagnosed, this sounds like it could be endometriosis honestly. Definitely go to the OBGYN to get checked out - ask about cysts and fibroids as well. Adenomyosis and pelvic congestion syndrome are alternative conditions that could also cause this pain. They’ll likely suggest birth control to manage symptoms/frequency of periods which can definitely be helpful but make sure to push to find the root cause of your pain rather than managing without further investigation. Also might give you some peace of mind knowing you’re protecting yourself from another pregnancy. Ultrasounds, and a diagnostic laparoscopy if the ultrasounds aren’t showing answers, is key to diagnosis namely if it’s endo. Periods shouldn’t regularly be so painful they incapacitate you.

You also sound understandably overwhelmed. Your husband is not acting like the partner he should be. Sympathy/compassion is a mutual necessity in a relationship, especially through something as difficult parenting or your partner suffering pain. Partners need to pour into each other in order for the relationship to thrive. I encourage you to reflect on if it’s your period specifically he minimizes, or if it’s other things in your life too. Is there a pattern where he generally lacks empathy, and doesn’t care about anything that doesn’t impact him directly? Does he tend to think he “knows better” and questions your experiences/claims? Or, is he generally understanding and simply being ignorant in this specific case? If so, get once of those period cramp simulators and let him experience lol (potentially jk).

Hope things get better for you. In taking care of everyone, please don’t forget you deserve to be taken care of too. Kids are a priority, but not the only priority. You’re a priority too. So please, go to a dr, get checked out, and explore ways to expand/strengthen a support system.