Is it normal to get nauseous, kinda shaky and feel like i like hot when i get a really strong urge to have a bowel movement?

"Vasovagal Reaction": The sensation you are describing is most likely due to a reflex called a "vasovagal reaction." Often people need to tense their abdominal muscles and strain a bit during a bowel movement. This tends to stimulate the vagus nerve, which slows the heart rate and can cause nausea, sweating, dizziness, pounding heart and hot flashes. It is a common reaction.