well, lets not kid ourselves, something bad has happened, and you are feeling negative since it has happened, which is natural. You can "try" to maintain a positive attitude, but it takes too much mental energy to do so constantly, in my opinion, especially since you willl be fighting both your intelligence and intuition which are telling you something bad has happened. I would suggest that you acknowledge the negative feelings, and use them to motivate you if that is possible. Basically, the problem is not that you are having negative feelings, but that they are interfering with your work. The problem maybe that you are identifying your work with your "self". For example, the change in business may mean a loss of some kind, which means you are hurting or losing a part of your "self". This maybe a reason why feeling of anger etc. start to overwhelm you. I would suggest that you disconnect your "self" from your work. I have found a way to use the concept of soul to disconnect my "self" from attachment to material things, while still having the motivation to work hard, in spite of obstacles, but my approach may not work for you, so see if you can find your own way. If identifying with your work was not the problem in the first place, then I am sorry I made you read this long post!
