i was going to suggest an ativan too. it's specifically for anxiety. and if it makes you a bit sleepy so much the better. i never open my eyes. that helps.

and ask them if you can lay on the blanket and then they can fold it over your legs. that may make you warmer. even another blanket on top.

warmer clothes should help. maybe they could even start the IV before you start so you'll be warmer. maybe cold veins are harder to stick.

i try really hard to make a visualization when i'm in the tube. like the noises are birds and i'm in a forest with streams running thru it. you get the idea.

your dh's idea is great.

YOU CAN DO THIS. good luck and let us know.