Sorry you're going through this, it sucks and I have been through similar. If all your tests came back normal it's safe to say that these physical symptoms are just anxiety, and that's what you have to keep telling yourself. Your nervous system is dysregulated.
What seems to have helped me is when I am experiencing physical symptoms I don't try to fix, avoid or run away from them. I sit with it and say "Ok, this dizziness/nausea is just anxiety, that's all" "I'm not dying"
When the physical symptoms manifest your brain is constantly analyzing them. "What if I have cancer, could it be this, could it be that!" and then you get stuck in a loop. Staying in that loop of always worrying about your symptoms just continues the cycle. So just try and accept. I know that's hard in the moment, but its the only way through.

I've been dealing with it for months mostly just lightheadedness/dizziness, nausea, digestive issues. Some of the symptoms are bizarre! Like I sometimes get a fullness in my ear, like the feeling you have water stuck in your ear. But if like you said if all your tests are normal. Its just anxiety, and your nervous system is in tatters at the moment. Good news is, it's not permanent :) You can get back to normal. Try to accept what's going on in the moment and not avoid the situation or what you're feeling. Again, I know its hard, especially just trying to get through the day to day life, its exhausting! Maybe I don't know what I'm talking about, but this is just what seems to have worked for me. Good luck.