Dear Eirelassey,
Perhaps the strain of trying to be upbeat at a new job despite the negativity of your supervisor has something to do with the headaches. It is a challenge to deal with negative coworkers but a supervisor can be a nightmare!
Can you see beneath to what misery must be in her mind, heart & soul? If you can muster some true compassion because of her suffering things may lighten a bit for you. Every situation is different & I cant say I know what is right in this one. Though I have had good results with letting go of my feelings & acknowledging to myself the misery in the other (...started to listen & observe with a different eye & ear & heard/saw pain)..this was after a long haul of righteous indignation at the way she treated me...it was easier for me to see her as the bad guy & much harder to see that she was full of fear. That does not mean that this relates to your situation, simply that I am reminded of it. It wasnt about protecting myself from her or her negativity as I originally thought, it was always about my reaction to her, the lesson was there.
peace & joy,
holobon