I have tried just about every anti emetic without success. what is the next step. my problem is gastroparesis with chronic nausea especially after eat?

See your doctor: Problems like these can only be correctly handled by your doctor in person. He/she needs to listen to you, perform an examination and possibly run labs or other tests. That's the only way he/she can find out what's going on and what to do about it.

Surgery : Failure of dietary modifications and medications leaves only surgical solutions left for treatment. These include implantation of a gastric stimulator (enterra), loosening the outflow valve of the stomach, or removing the stomach.