Does anyone have tips for calming a dog during a storm? Has anyone used the Thundershirt?

My poor pup has anxiety during storms. It's a hard and sad thing to watch. He shivers severely, urinates, pants, attempts to practically get under me, goes off of food for hours, and absolutely freaks out if someone is not in sight. This dog is normally fine, zero separation anxiety otherwise. He's a good dog.

The vet and breeder both recommend I try to distract him, turn up the tv, put fans on blast, or otherwise drown out the sound, and to not coddle him. I put a dark blanket over his crate and leave it open for him (which he usually loves), but during storms refuses to go in his crate. I also keep him by my other dogs, none of which are fearful of storms, in the hopes that he will see from their behavior that there is nothing to worry about.

Unfortunately these methods have not worked. The last resort is to put the dog on medication. For his comfort I may need to do that, but would like to explore other options as well.

Does anyone have experience with the Thundershirt? I have one ordered and hope it will help. I am curious about other people's experience with it with their dogs.

If anyone has any other advice or tips, please share!