It depends on the cause of your disease. If the EG was brought on by a parasite, get treatment for the parasite and hopefully your symptoms will disappear.
If it's a food allergy, a scratch test can show several different types of food allergy to you know what foods to avoid. It can also help to go on a diet free of inflammatory foods.
If it's bright on by autoimmune disorder then hold on because you're in for a ride. Medications are not always effective but they're are several types that can be prescribed to try and lessen symptoms such as;
Acid reducers
Immunosuppressants
Antidepressants
Steroids
Antibiotics
Anti nausea medications
Allergy shots
Allergy medications
And many many more.