Will laying on my stomach mess with my scoliosis?

I have no medical knowledge, but you really should study some books about nutrition because it often helps. Your spine is made of calcium and vitamin D. The pads between the discs are made of vitamin C. The muscles that pull the bones into line depend on magnesium to make them strong. A deficiency of any of these nutrients can cause many problems and doctors often are unable to diagnose them. You need to study the subject so you know how to eat right.

Magnesium deficiency is quite common in the USA. Magnesium strengthens muscles, calms nerves, stops cramps, and fights infections. Get epsom salt. It is cheap, five bux for a year's supply. Put a dose in a glass with water to cover and stir until it dissolves. Fill the glass with lemonade and drink it. You can take it without the lemonade but you won't like the taste. Milk of magnesia is more expensive but nicer tasting and gentler laxative action. Your choice.

Another possibility is that you have a lousy mattress. You might want to consider getting a full wave water bed. Except you can't have one if there is a cat in the house. An air mattress is almost as good and quite cheap, but usually has to be replaced every year or so.