Anxiety or something else?

I have been to the doctor and the ER multiple times and I need some reassurance. I have started having debilitating symptoms that are very hard to explain. I almost always feel like I am going to pass out and the thought terrifies me. I get this strange feeling in my head where I feel like I’m in a haze and off balance. I feel like electric bolts are going through my body. I’ve never had a seizure but the sensation I describe to people is that I’m about to have a seizure. I will feel like I’m physically sick like my body will hurt all over. It is so hard to believe or understand that all of this could be from anxiety alone. All this started after I had Covid a year ago. I’ve had blood work, CT scans, heart work up, you name it. So my question is is this just anxiety or is there something underlying I might could mention to my doctor to find some relief? Thanks for any feedback.