Given the list of problems you shared, you might benefit from immunoglobulins.
It's also possible you might have some infection. Why do you think doxycycline is the answer, though? It's best to know what infection you've got and treat it with the appropriate strategy, before taking a medication that will kill certain constituents of your microbiome.
I just spoke with a mito doctor this week who said SS31 has not been successful for the patients he tried it on.
It might be worthwhile to match up the abnormal test results you have with the treatments that treat them.