New York Life thinks they know how I feel inside my head

I have been denied short-term disability by New York Life's health car insurance company. My case being a depression/anxiety claim that they received expressing that my doctor’s advice not to go back to work due to old medication withdrawals and the time for the new medication to get into my system. I am a mechanical inspector by trade and my inability to concentrate and focus through the withdrawal process and new medication while reading blueprints and programming inspection equipment. How do these people know how I feel inside my head and blow off my doctor’s recommendations? Pain and suffering, stress and no pay for one month I want to get the money owed to me plus more. They’re suppose to be working for me.