We do recommend checking in with a healthcare provider when someone's experiencing severe cramps, so that they can rule out any underlying health issues, such as PCOS or endometriosis, that might be contributing to that pain. We can certainly help you look for a doctor in your area, if you need help finding someone that's accessible and affordable. If you want any help with that, just let us know where you are and we can check it out.
Other than that, you've certainly tried many of the tips I'd suggest. I do think it might be worth it to revisit heating pads or other heat sources as an option; if you find that a heating pad is too hot and it doesn't have an adjustable temperature, putting another layer of fabric like a towel or blanket between it and you can help cut down on how hot it feels. There are also a few suggestions you haven't mentioned trying out yet in our article on dealing with cramps which you can find here
, so maybe that will give you a couple new ideas.
I'm sorry your cramps are being so stubborn and painful; I know it can be a huge challenge to deal with that much pain on a regular basis. I do hope we can help connect you with some healthcare, if you're up for it, and that there's at least one thing you can try from that article that might give you some relief.