What does inner ear infection feel like? Can it cause lightheadedness, upset stomach, sob. Anxiety like symptoms?

Depends. A inner or middle ear infection (media otitis) can cause a whole spectrum of symptoms. Fever, pain, loss of balance (as the inner ear is integral in how your body interprets positional changes). If your balance is thrown off, then it is likely that stomach upset and nausea would follow. It is something that should be treated asap, as it can rapidly cause lifelong loss of hearing or impairment.