If you find yourself thinking, that the work is making you sick, look at what you are thinking, and see if that’s something you really desire to create for yourself. If it isn’t, assert to yourself, out loud or silently, and with emotion, ‘I am strong and well, when I do my work,’ or ‘I am eternally physically powerful, fit, and young,’ or something which feels good to you. Say it repeatedly, if essential, and say it with emotion, until it feels like it has sunk in. By just becoming more attentive of what you are saying and what you are thinking, you will find that you have plenty of material to deal with.