For such a teeny virus, Covid has sure impacted the lives of millions of people world wide. I’m so sorry you’re one of the victims of this awful pandemic. And sadly, as you can see, you’re not alone in seeking a solution and relief from the side effects that are lingering in some people.
The symptoms just keep coming; from neurological issues of brain fog and neuropathy, to exhaustion, auto immune diseases, to heart and lung problems, etc.
There are other viruses which can also cause long term effects such as Epstein-Barr. But Covid seems to have upped its game with residual effects.

As with every medical facility, since this is such a new disease with evolving discoveries caused by the virus, even Mayo has a supply/demand issue for appointments with patients seeking answers.
Because of the acute shortage of medical personal across the board there aren’t enough people to staff and meet all the needs. This isn’t central to just Mayo Clinic.

If more people cooperated to get this virus under control by getting vaccinated, wearing masks and taking simple precautions, in time the over worked members of the medical field will be able to return to helping people recover.

So while I share your frustration, it’s not fair to say that Mayo gives false hope. Believe me, ‘they’ hear you. That’s why there are long hauler clinics available. It is distressing to find waiting periods so I really join you in the hope that more clinics will be up and running soon, by all medical providers in each country. There are so many unknowns with this disease. More time and research needs to be done to find solutions.
It doesn’t help you in the meantime. But I’m glad you found our Connect forum to be able to share your story and exchange thoughts with others who are suffering with similar symptoms…to know you’re not alone.

Mayo Clinic remains a bastion of hope to people world wide for so many medical issues. You can be assured the researchers at Mayo are doing their best to find answers to the Covid side effects.

With your neuropathy symptoms have you visited our discussions in the Brain and Nervous system group? https://connect.mayoclinic.org/group/neuropathy/