Acid reflux/silent reflux

Has anyone baby had this?
She is 6 weeks old
I began adding cereal to her formula to thicken it up some I add 1/2 tsp .
What else can be done 
Dr didn't want to put her on meds wanted to see if this worked first 
She is on enfamil newborn formula
At first she was on the liquid kind but then we started using the powered kind and that's when I noticed the change. 
Also what's a best way to get her to actually get some rest bc she is barely sleeping in assuming due to the discomfort.