Hello I Have An Oily Greasy Taste In My Mouth

hello i have an oily greasy taste in my mouth for the last 2 days. I cant get rid of it, I brush and gargle with salt and it wont go. I feel slightly nauseus. I do have blood sugar normally a bit high possibly diabetic. Ive been eating more dairy desserts in last 48hours and fried chicken pieces. I am 6feet 2inches and weigh 109kg.Not sure what else to say