My 7 Year Old Has Stomach Pain...

This might be relevant or not but it happened to my son. My son started having stomach pain off and on to the point he could not walk very far, like at the zoo. Went through a lot of things, no help. An ultrasound showed nothing. About a yr of this or more.
Then one time he had strep. Got antibiotics and a follow up appt. He still had strep. One more round of antibiotic. Not only did it cure his throat but his stomach pain. I believe strep had colonized in his stomach and was causing his pain. It's really cheap and not too many side effects for a couple rounds of strep killing antibiotic, just saying.

My son gets backed up as well. Have you thought about the cause? With my son it is because he has a hard time digesting milk proteins, so we switched to Almond milk and limit his cheese and yogurt and he has not had any further issues, but if the first blockage is still there and he is still eating the causal food then the situation will just get worse.

I have GERD and started taking Prilosac. It does take several days before it's of any help. I suggest that the doctor has said to try it for a month before sending him to a specialist because he knows that it takes that long to know if it's helping.

I also suggest that he may continue to be constipated and this is a part of the pain. Continue giving him the Miralax. Be sure his diet has enough fiber and that he's drinking enough fluids.

Here are guidelines from The Mayo Clinic. http://www.mayoclinic.com/health/constipation-in-children...

"Lifestyle and home remedies
By Mayo Clinic staff
Often, simple changes in diet and routine help relieve constipation in children:

A high-fiber diet. A diet rich in fiber will help your child's body form soft, bulky stool. The amount of fiber a child needs every day varies by weight. Give your child 0.5 grams of fiber every day for each kilogram of body weight. One kilogram is equivalent to 2.2 pounds. So if your child weighs 44 pounds, divide that number by 2.2 to figure out your child's weight in kilograms. In this case, the child weighs 20 kilograms. To figure out the fiber, multiply the weight in kilograms by 0.5, which in this example leads to 10 grams of fiber daily. The upper limit of daily fiber for children is 35 grams.

Offer your child high-fiber foods, such as beans, whole grains, fruits and vegetables. Limit foods that have little or no fiber, such as cheese, meat and processed foods. But start slowly, adding just several grams of fiber a day over several weeks to reduce the amount of gas and bloating that can occur in someone who's not used to consuming high-fiber foods.

Adequate fluids. Water and other fluids will help soften your child's stool. Be wary of offering your child too much milk, however. For some children, excess milk contributes to constipation.

Adequate time for bowel movements. Encourage your child to sit on the toilet for five to 10 minutes within 30 minutes of each meal. Follow the routine every day, even during holidays and vacations.

Be supportive. Reward your child's efforts, not results. Give children small rewards for trying to move their bowels. Possible rewards include stickers or a special book or game that's only available after (or possibly during) toilet time. And don't punish a child who has soiled his or her underwear."

II would request a swallow study to confirm the reflux. If the pain doesnt stop soon I would request to see a GI way sooner

One of my children at 7 complained off-and on of stomach pain and also had hard stool, and took antacids... and after depression at 9, the doctors were saying her pain was from depression.

But what was actually wrong was she was in dire need of healing her gut. She needed probiotics and dietary change. Unfortunately, the dermatologist does not think of diet. The pediatrician does not think of diet. The psychiatrist does not think of diet. I guess that is why she is now getting her Master's degree in Dietetics!

She cannot have Gluten or Dairy.

The best thing is to address the cause head-on rather than attempt to cover up symptoms. However, finding and addressing the CAUSE was a long road for us. If I had to do it over today I'd start with Integrative or Functional Medicine doctors (who also can be GPs, pediatricians, and Family doctors).

My daughter went through something similar. She was a picky eater so the doctor had her on a daily multivitamin. She took it for a few years. She'd complain of stomach pain on and off and it got so bad that one day she went to the er. They couldn't find anything on tests, so said it was a UTI. She still had pain. I stopped the vitamin and within a week the pain was gone and has never returned. She was overloaded on something from the vitamin that caused it. She was due to go to all sorts of specialists, but we were fortunate not to have too. I'd ask about your sons diet and see if that couldn't be the problem. Good luck.