GERD and small children is hard, but I've survived it!
Find all the ways that you can help your symptoms that are also compatible with family life - regular meal times, don't eat within 3 hours of bed etc. Keep knocking or your GI physician's door until you have good symptom control. Find out which natural remedies help you - it's a long experiment I'm afraid and sometimes you find things that make you worse, but you add that into your strategy and move on.
Stress has to be tackled too - GERD just feeds on it, so don't let it!
And try to enjoy your kiddies - they remind us what we are fighting for and why we push forward and refuse to be squashed by our symptoms! And they can be a great distraction too!