Shaking

[mrslancer]

Just wondering if anyone has experienced anything like this before:
This isn't the first time it has happened to me, but it hasn't happened in a while;
Tonight I was just getting ready for bed, layed down, got comfy and snuggly warm up to my DF, then my stomach started to feel off, I started to feel very warm, despite it being rather cold, and have now got the shakes. If I focus right I can stop the shakes but they keep coming back, full body, like I'm cold, But when i get under the blanket I feel super hot, more than I should be, even when wearing a singlet. legs under blanket sees fine but i cant stop these shakes/shudders/shivers.
If I sit with my knees to my chest my stomach feels better, but as soon as I stretch out and even slightly lay down it feels yuck again.
It's super frustrating as I am very tired and want to sleep But I cant