JESSICA Simpson is not a happy camper lately - mentally or physically. During the after-party for her sister Ashlees London debut in Chicago, Simpson stormed out of the Sound Bar shouting, I dont want to be here - why wont people just leave me alone? Later, her dad Joe told the Mirror, Jess is quite down at the moment. Shes not comfortable talking to people as shes quite depressed and were walking on eggshells. Meanwhile, at a recent shoot for a Direct TV commercial, Simpson kept everyone waiting for over an hour - due to a stomach bug, spies say. Her mane-man, hairdresser and constant companion Ken Paves, was overheard telling people, Well, what do you want her to do? [Bleep] her pants? But a rep for Simpson denied any physical ailment and said, there was a minor delay but simply because her voice has not yet healed.