My Mom is always sick to her stomach, she is not holding anything down. Any advice?

this is serious and needs different doctors if the first one can't solve it or blows it off.
problems that cause vomiting can be GI, renal with electrolytes out of whack, medication side effects, or even increased pressure in the brain.

someone who can't keep even fluids down does need emergency attention.

Get her to the ER, do not delay. If she has a blockage, it could kill her.

Lynn, have the doctors checked her for acid reflux, similar symptoms. If it is not that, the tests could lead to something else, like she is eating too fast.