How to feel comfortable in my body again after panic attacks?

Started having panic attacks and dissociation two years ago. I ve been checked out a million times by different docs and they all say my symptoms are anxiety. I ve had probably almost every test done on me. I m starting to feel more real and here but I dont know how I m suppose to feel in my body. I ve been dissociating so much I don t know what "normal" feels like. I ll have times where I think I m fainting or not breathing cause I feel too relaxed.I also get times where I m afraid my throat will close up or I ll stop breathing. I literally think I m going to die. So idk how to even feel when I m not feeling weird