If you put "mask" in the search box at gemplers.com, they'll show you four pages of disposable and cannister masks. Different masks are designed to protect from different substances.
A mask has to seal against your face, but I don't know why it would make you woozy. You can get overheated if a mask traps the heat from your breath. Masks with exhalation valves are cooler. If my dentist used masks with exhalation valves, he wouldn't need so much air conditioning to stay cool.
Surgical masks protect doctors from inhaling spatters.