Hello,
I have had many of the same symptoms you have, along with trembling hands, jolts in my legs mostly, and at night. I was hospitalized last Oct. for three weeks. The post covid symptoms began in February, and I was hospitalized for three days and every test was made. All came out well and that is when I was told I must have Long Covid. Since February I have seen a cardiologist and had many tests done, invasive and non invasive. However I sometimes feel like I'm having a heart attack, with pain surrounding the heart. I get pain in the back--lungs, shortness of breath where just walking across a room brings it on, and have had sighing. Never a fever though. I have also seen a lung doctor and will see him next weeks for the results of the latest CT of my chest. Right now my biggest concern is the profuse perspiration. It never goes away, sometimes is mild, when I'm just sitting, other times I am dripping. There is no test for this so far.
So, like you, all testing comes out well. The only relief I have received is from a Functional Medicine doctor. It's only supplements, but the night time jolts are just about gone, the hand trembling is almost gone as well. At one time I couldn't lift a glass or anything without spilling the contents. The shortness of breath and the smell in my nose comes and goes. The completely different blood work that this office has done shows that I had mono at one time, news to me, but anything is possible. I am on a regimen that treats mono since there is no treatment for long Covid. The psychiatrist my primary doc recommended has me on three anti depressants. I have not mingled in large crowds since the beginning of this epidemic, for three months I did not even go out in my yard. I don't know how I caught this. I will continue to adhere to the original precautions as I understand this winter will bring Covid back with a vengeance. I hope that is wrong info. Hopefully in time, a cure will be found, but there are so many different symptoms. Patience, I tell myself is all I have now, and hopefully the Functional medicine supplements will continue to help. This week my lower face has swollen up. Another symptom? My primary care has me on a steroid pak, but I see the functional medicine doc Tuesday. I'm glad to be alive (I was told I had a small chance of survival).
I understand your pain, your frustration, and the uncertain outcome of all this.
I wish I had more to say on recouparating, but my only resource for any progress, has been with functional medicine, and this is a medical doctor with a full staff of NP's. Good luck, keep posting, and God bless us all-we are still here.