I'm at my breaking point

I am experiencing what I assume is anxiety at a level I have never come close to. In my 42 years, I have been anxious before, obviously, but never to the point that it is controlling what I can do and changing my bodily function.

A week or so ago, I was eating and started to feel lightheaded. It was like a wave. It came and went. That was the last meal I have finished since then. The lightheadedness has been there for every meal, and it's now so intense I just stop eating a few bites in.

I get lightheaded, the room seems brighter, I feel one step back in my body, and I look through a tunnel. It's so intense that I end up laying on the couch and collecting myself for a while. When it's done, I feel exhausted, and my arms/legs are heavy. I used to work out daily, and I don't have the energy to lately. That is adding to the stress I have.

I have been to the doctor and had my sugar checked, urine tested, bloodwork done, BP checked, and even went to the cardiologist for my yearly check up. Going into that appointment I was bouncing my leg in the lobby, gripping the arm of the chair, and grinding my teeth. My BP was high but they could tell I was anxious so they had me lay down for a bit and when they retook it, it was 120/82 so basically perfect. I'm going next week for a treadmill test and echocardiogram. I'm not worried about those as my daily workout is uphill on a treadmill and last time I had the test I finished easily.

Nobody is concerned with any of my test results but there is still something drastic going on. That leaves me to think it's health anxiety. I feel like I'm constantly on edge and about to hyperventilate. I even woke up in the middle of the night for a 3 hour break where I couldn't lay still and fall back asleep.

I take care of a 3 year old and a 5 year old daily that need their dad to not be "sick" anymore and I'm doing the best I can.

I hope I can get some sort of control on this soon.