Sour taste

Elise • Married to my highschool sweetheart❤️, 2.5 yo daughter 👧 and pregnant with my 🌈 rainbow baby 🤞
I have a constant sour taste in my mouth, nothing, including brushing seems to get rid of it. Gum just masks it temporarily.  Anyone else experiencing this and do you have any good remedies to get rid of it?