The symptoms can be physical including muscle aches, feelings of fatigue and interruptions of normal sleep that may lead to insomnia. Mental symptoms are also involved and this might include mental fatigue, feeling of forgetfulness and decreased mental alertness. The good thing is that all these symptoms disappear after some few days. For more information see http://www.ehow.com/about_5687802_fatigue-anesthesia-symptoms.html.
Yes it can cause stomach to swell. it depends upon procedure. If stomach was under examination. they must pump up the stomach with air to get a better look. Gently massage stomach. You should be passing some gas. Call in to your Dr.