Brief Answer:
Supportive care

Detailed Answer:
Thank you for asking

i read your question and i understand your concern. Heaving or retching with acid reflux is common and worsened by dehydration so yes your doctor has a point. As far as hernia as a cause is concerned, Diaphragmatic hernia if the cause , then is mostly congenital since childhood and very severe. I dont think it is the case in your illness. All you need is slight diet and lifestyle modifications, some antacids, plenty of fluids to keep hydrated, losing weight,eating small frequent meals, delaying lying down after the meals etc will help.

I hope it helps. take good care of yourself and dont forget to close the discussion please.

Regards
Khan

---