9 week old with reflux

My son is 9 weeks old and suffering from reflux. I thought he was getting better then he started again with the arching of his back and constant crying with feedings. The newest thing is his noisy breathing. They adjusted his meds and i'm constantly changing his position, but nothing works 100%. He does eat, nap , and seem happy, but their are many many momets when he isn't.Their are many days when I feel all i do is hold him.  He is going for gastro scan and upper gi next week.I feel like my pediatrician thinks it isn't necessasry because he is gaining weight. Well i disagree. I will do whatever it takes to make him happy and comfortable. I don't know any moms with reflux babies so i use the internet. I hope i can find some tips and info..