I get them frequently around this time of year and found that making myself as cold as possible is the only thing that helps. I usually use an ice pack, water, and a fan first (with my head buried in a pillow to block out any sound) and if that’s not enough, I’ll go sit outside on the porch in a tshirt until I cool off and it goes away. It’s super weird but it works.
It’s so weird that I just started seeing posts from this group on Facebook a few days ago and now there’s a lemmy community for it.