I Have A Thin Layer Of White On The Sides

I have a thin layer of white on the sides of my tongue. My mouth has often been dry and the top of my tongue feels a little rough. I also have a sour/metallic taste in my mouth. I was just treated for gastritis 4 weeks ago and one doctor said I may need to be tested for h pylori. No other symptoms - here are the mess I take
Synthroid
Prozac 20mg
Adderall 15mg 2x daily
Clanasapm as needed
My annual blood work was perfect 2 months ago. If I have h pylori could that be affecting my mouth?