How to diagnose allergies most efficiently and affordably, aside from muscle testing? Have not had luck w allergist or osteopath. Still have reactions

Allergy specialist. https://www.med.unc.edu/tarc/about-us/faculty/edwin-h-kim-md-ms He should be able to help you.
Depends. If a B/C allergist couldn't help you, then your problem may not be from allergies at all since there are other entities which mimic allergic reactions. Muscle test is a waste of time since it has nothing to do with any allergic reactions as we know them. Give a more detailed description on your symptoms so that we can understand what your needs may be.