I'm not a doctor so I can't confirm or deny but my advice is get a 2nd opinion if your current doctor is refusing to do further testing. I suggested Kerataconus because of the severe dry eye symptom that you have. Doctors missed out on my KC and realized it when it was too late for one of my eyes. Regardless of what you suspect it might be, just go to a different doctor or even multiple doctors cause it's common for them to miss out on things.