Issues with eating
Return to your Dr and tell him/her those symptoms. It is normal to occasionally throw-up in the beginning... not chewing enough is usually the issue but "quite often" is not normal and accompanied with pain... perhaps an ulcer, something else, get in and let the Dr assess. For example 8 years out I can count on 2 hands how many times I puked. Hope it is easily resolved and you are feeling 100% soon. Update.
Return to you doctor immediately, These symptoms seem abnormal.
Online Nutrition Advice by JPD Nutrition.
Return and tell him that you are not feeling any relief and ask him what are the next steps and what if those don't work. Don't allow him to send you home unless you have answers and a new plan and when he will follow-up on whether the new plan is working.
Good Luck. My guess is it will take some time to heal but perhaps a different medication might help. Hope you are feeling 100% soon.