I have been seeing a functional medicine doctor. These kinds of doctors look for the cause of symptoms. Prior doctors I had seen treated my symptoms with pharmaceuticals. When I went off, my symptoms returned.
Testing included a blood test and a urine test, checking for mycotoxins and antibodies.
You can look for a functional medicine doctor on ifm.org. You can search by city and state. Look at biography info as each doctor lists what they specialize in.
Feel free to get in touch with me if you have other questions.
Best to you. I understand.

Have you contacted the state department of health where you live?

Here is a Web Site that may offer resources near you:
https://getmoldtested.com/National_Directory.php
Finally, mail in tests are not likely to be of value in getting treated - here is information about the complexity of figuring out which mold exposure is causing your symptoms:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8982061/
Generally, where are you located?
Sue