White coat on my tongue

I have had this issue as far as I remember. All this time I thought that I did not have digestive issue. But now that Im older I'm having heartburn issue and all that. I also have itchness in my rectal area. It seems like when I walk for more than 5 minutes it starts to aggrevates the issue. I read it about it online that certain food can contribute to it. Also I have increased mucus build up in my throat. Anyone else has these symptoms? I need help to get rid of these symptoms helpppp Tweet