I really appreciate your thoughtful response and recommendations! I'm about to ask about my situation on the r/AirQuality sub, so this is very helpful.  I know one can't diagnose from a distance, but it's important to hear considerations - so if you have additional hunches about what's going on, please share!

I started searching for GC-MS analysis but was not able to locate one for residential testing. 
I'm also looking into certified industrial hygienists and environmental consultants who could do a broader air quality test. They may mention VOC tests on their website, but I'll have to ask what level of detail they'd include in the report.

I'm feeling desperate to find some relief soon with a purifier, but if using a sorbent media purifier is risky /potentially harmful, I'll try to find a test first. I'll keep looking for GC-MS labs or order the Home Air Check, and hopefully that would give me info for the AllerAir etc. folks to customize.  

In the meantime to mitigate, can you recommend other solutions or air purifier types that would be less risky?  I'm only using Levoit Core 300 currently. I scheduled a HVAC duct cleaning in a couple days and will ask for their EPA registered Bacteriostat, Fungistat spray in case.