Stress make me lose my appetite.

I started my own company and while things have been going good for the most part, it is stressing me a lot. I have lost my appetite and I barely eat during the day. For the past month I have lost around 10 pounds which is making me look haggard :(  Some of my loss of appetite is psychological I think, since I get hungry but I just don't want to eat. Sometimes I feel like I am punishing myself. Is this normal?

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