I was diagnosed with cushings disease 2 yrs ago, small tumour was removed from my brain, lately I have been feeling tired, sluggish, light-headed,headache, nausea, endocrinologist states my labs are ok, cortisol levels fine. symptoms began after I took flu shot 3 weeks ago. doctor tells me to take gingerale, and Tylenol. second day home from work, have to go to work tomorrow, concerned.