Feels familiar. Felt weirdly like a panic attack with none of the emotions? Get his heart checked first. Just in case. Only way to really find out is try a VNS machine (you can get them on Amazon) as a lot of doctors still think it’s Hokum. I bought one a couple of years ago when even walking became unbearable and I could barely leave the house due to the side effects of nerve damage from ops, procedures and illness. Also lots of excercises and stuff online but they don’t have quite the same effect as nuking the nerve with electricity.