Onion should be fine.From experience,diet is very important.Don't forget to steam and eat some or all of the pulp from the juicing. You are doing the procedure correctly.You should have shown an improvement in your symptoms from your start of the procedure.Only you can know.If there has been no improvement,we have to look for other reasons.Only steady improvement shows the procedure is working toward healing for your condition.Your paying your doctor for his knowledge.Tell him of your experience.He will probably disagree with the procedure but should take the time to listen.You have to live with the condition.The decision is yours.