My 23 mth child vomits around midnight 3x a week. Coughs, stomach rumbles, vomits profusely. Night sweats. Grinds teeth all day. No virus. Parasites?

Ped gi. Possibly esophageal regurgitation which can be treated. Seeing your peds doctor or pediatric GI doctor can be helpful.
Care for teeth. The repeated vomiting is not normal and should be addressed by you pediatrician. However, you must take care of your child's teeth with this exposure to the acid in the vomit. Brush or swab the child's teeth after the vomiting to clean them and neutralize the acid. The acid can cause the teeth to dissolve or further tooth decay. It is important to care for these baby teeth.