Colds can cause busted ear-drums and severe incapacitating pain 
Use of AME and OKC for medical questions, including free resources from AOPA &amp; online 
Spatial disorientation can include or cause, or be caused by positional disorientation 
Fatigue makes everything worse 
Airsick child passenger might have low grade ear infection 
If DUI/Alcohol-related arrest, must report to the FAA, NO EXCEPTIONS. Then, the final result must be reported. Consult a competent aviation lawyer in addition to your arrest defense lawyer. 
Scuba Network DAN for decompression sickness:  +1-919-684-8111 FREE  or +1-919-684-4DAN (Collect) and http://www.diversalertnetwork.org for more information 
Aeronautical Information Manual recommends altitude chamber flights, these are still available. Take a pulse oximeter. 
FAA policy is to preclude flying if on various types of disability benefits, especially Social Security Disability. Long Term Disability benefits may preclude flying, check with AME and document that you checked with your AME.