Pediatric Vomiting Pediatric Question 2 Year Old Toddler - Vomiting And Complaining Of Stomach Ache For Months. Please Help?

Pediatric Question 2 year old toddler - vomiting and complaining of stomach ache for months. Please help? - pediatric vomiting

I have a two and one and a half, the son has been healthy since birth. Eating in the past two months, and not to complain, not a day for things like "I vomited, but did not go" or "What do you bring in my throat and my stomach hurts?" He joking a lot, while trying swallow food, and possibly vomiting and sometimes vomiting after eating. Vomiting usually at least once a day. 3XS the pediatrician double dose of medication taken for allergies give it (says she much drainage) and acid reflux drugs. It did not work, the blood and everything seemed a little low in protein.
Has anyone any idea whether it should investigate the situation further, or what could be causing this? I was so disturbing, but the dr. only reassures me that the drug can provide for them. He is taking the medication for 3 weeks and has more than twice the dose of the medication for allergies for a week still no improvement.