Bad mouth smell. Could you please give?

Respected sir, my age is 31 years old. I am suffering from bad mouth smell from my childhood onwards. The smell restarts again even after i brush every time. After waking up from my afternoon sleep, if I spit out then it comes like light mixing of olden days Colgate white tooth powder and clearly I feel the sense of something is applied on my mouth and all over the teeth. At that time if I brush the teeth with my bear  finger, then it senses that a little tight move over the teeth as may be of sam layer form. Until 25 years old I noticed a frequent bleeding while brushing on mornings but now it doesn't except some times. Many years ago I consulted a doctor and he prescribed some gargling liquid. Moreover, I have a small bump on right side of my throat without any pain or symptoms from my birth. One of home doctor said that it may be a lymph gland. By the way, still now I don't know the reason for my bad mouth smell whether it is related to ENT or dental Problem. Could you please give