What is required for you to heal is 100% acceptance of the fact that your symptoms are psychosomatic. You cannot take drugs and at the same time treat your GERD as TMS. You also cannot avoid certain foods or follow other suggestions, natural or medical, for treating your GERD. If you believed 100% that your symptoms are psychosomatic, i.e. TMS, why would you do all that? You wouldn't. By trying to treat it as TMS and at the same time taking drugs, avoiding certain foods or doing anything else to "fight" your symptoms, you are sending mixed signals to your unconscious mind. Mixed signals won't cure TMS, only certainty will.
So decide if it's TMS or if it's not. Don't be on the fence. If it's TMS, treat it 100% like TMS -- realize, that it is initiated by psychological processes and then let go.