The mental illness that causes someone to be overwhelmingly grossed out by everything to the point of panic attacks is likely to be a specific phobia, specifically a "gorephobia" or a severe form of emetophobia (fear of vomit). Both of these phobias involve an intense and irrational fear of certain stimuli, such as blood, injuries, vomit, or other bodily fluids.
People with these phobias may experience extreme anxiety, panic attacks, and even physical symptoms like rapid heartbeat, sweating, and nausea when confronted with the objects or situations that trigger their fear. Their reactions can be so severe that they may go to great lengths to avoid any potential exposure to these triggers.
It's essential to recognize that phobias are genuine mental health conditions and can significantly impact a person's life if left untreated. If someone is struggling with these symptoms, they should seek help from a mental health professional who can provide support, counseling, and, if appropriate, offer treatments like cognitive-behavioral therapy (CBT) or exposure therapy to help manage and overcome these fears.