You asked if I could be more specific....so here are a few ideas. You said that you felt better on vacation...in this approach that would say that your mind and body felt "happier", so they did not feel the need to "send" you any symptoms...(I know this all sounds a little crazy, but bear with me)....when you got back form vacation, your mind and body got mad or upset per usual and per usual rather than letting you feel all that upset, it sent you symptoms to "distract" you from the unpleasant or scary feelings...so your symptoms return and you are miserable again.
But never fear, you can overcome this and rather fast. I would try sitting quietly for say 30 minutes and think about anything that could be upsetting you...think about job stress, family stress, childhood stresses of long ago and just be in those feelings...make notes if you like...you might try imagining a door marked "anger" or "sadness," and try opening the door and walking in...this can be very powerful, so be careful....at the same time, tell your body that you are OK with those feelings existing and that you don't need a distraction symptom...you should feel a palpable sensation of something letting go or stopping...so the technique is not just relaxing or exercising or getting a massage to relax, it is doing conscious work with these topics in mind...
I also like to picture the affected area (stomach, e.g.) and ask it to talk to me...why is it upset?
Once you get the feelings going...and have waited a few days or a week, you should start to feel physically better, perhaps feel that any inflammation is going away, etc. Then to complete the treatment, you will then have to reduce the drugs (under doctor supervision perhaps) and other symptom related things that you do...why?...well because the symptoms will try to overcome your remedies, so remedies are counter-productive...they trigger the brain to produce more and stronger symptoms to continue to get your attention...I found that after a few days of meditation, I could decrease my meds and then slowly stop; slowly I had a beer and ate some chocolate and did other no-no stuff...my body got to the point where it would refuse to produce any more symptoms...why should it? there was no point....now of course if I ate ten hot dogs I would get a stomach ache like any normal person and I had to get sleep to stay healthy, but if I felt a twinge of symptoms and reached for a no-no beer rather than my pills, it really sent a strong message to my body that I was back in charge and that the game was over
An analogy would be if you had the flu and after you got completely over it, refused to get out of bed or go back on normal foods...babying your body at that point would actually slow recovery...you would get stuck in a sick zone...that is your body now with GERD...stuck in a sick zone that serves only one purpose, to distract you from the pain/rage of the stressful life you lead
By the way, if you have the ability to lead a less stressful life or make needed changes in your life (like quit a too stressful job) and know that, but refuse to act on that, that is not good...knowledge may stop the symptoms at first, but if you want long-term relief, go ahead and make the change...otherwise you are punishing yourself, which causes more internal rage...so the answer is not just the meditation, but the action of change that matters...
according to this technique, if something is difficult and you can't make a change, then all you need to do is to acknowledge it...if you are stuck in a bad job, but absolutely can't quit right now, that's OK...but when you CAN quit, you'd better do it or you'll hate yourself
if you are successful curing your GERD this way, symptoms may creep in from other parts of your body...your skin may break out or you might get headaches or backaches or allergies...your body is trying to fool you again another way...simply use the same technique to stop those symptoms, too
for more research on this, look up TMS...that is the clinical name for this healing technique
as I said, this all sounds rather crazy, but it has worked for a lot of people, thousands; it is not well known because it puts medical specialists and drug companies out of business, and it sounds wacky...normally I would hate this kind of approach but I was desperate and it worked : )