Go see a doctor and Stop painting until you get a fresh air Mask or full suit! Read the labels of the products that you are useing. Paint products are VERY dangerous! If I were you I would find out what the state law is regarding Safety equiptment and then I would go to the boss and say this is the suite I want and if you are not will to provide it I AM OUT OF HEAR! Be prepared to Walk! Then if you walk report him to the local OSHA rep and or the state employment agency. I am guessing that the last painter got sick or feed up or both and left.
Good luck