It sounds like you have yeast on your tongue. Look on the Standard Process website and there is a supplement called AFBetafood that will clean your bile and get rid of the yeast.
Hey
I'm only 26 and I have the same thing but my tongue is yellow-for me its gastritis, ibs, swollen colon and acid reflux...all due to stress and taking antibiotics growing up for constant ear infections, strep throat, etc. Don't take Nexium or any of the heartburn meds!!! they will do more harm in the future! sleep sitting up, eat foods low in acid (no tomatoes, spices, etc), try apple cider vinegar with the mother (u can google it), and take acidophilus. You can also try dgl for stomach pain-its licorice root-it coats your stomach with a lining of mucus to help.
white coating on tongue can be a yeast infection. If you try to brush it off with a toothbrush but it does not come off, it probably is a yeast infection, or also called "thrush"
You said you "tested positive" with an ultrasound - positive for what?
It sounds like you have GERD.... I would just watch what you eat and don't eat alot of gassy foods...