Hello, I have had those symptoms but I have been diagnosed with POTS, Neuropathy, etc. My knees buckle and I fall. I have all kinds of horrible nerve sensations due to the neuropathy. I get headaches and pain in my neck that are debilitating. I do take gabapentin and cymbalta which help but do nothing when there is a pressure change. I have gastroparesis. And on and on. I was told by my long Covid clinic that Long COVID turns on the bad genes in your body. While we may have similar issues we are also going to be unique based on what genes we have and how they are being impacted. I am so sorry this is happening to you. I hate that it is happening to all of us. Good luck. I wish you the best medical help you can find and the best way to live with your new normal.