I always taste syrup in my mouth more when I wake up for the last month?

See your dentist. Dentist can rule out any major problems in the mouth or point you to right doctor.
Syrup taste. The most common cause of a "syrup taste" is the presence of ketones. Ketones are a product of the metabolism of fat. When you're body does not have enough sugar to burn, it burns fat instead and makes ketones. Ketones are most commonly present in people who have been fasting, drinking a lot of alcohol, or have diabetes.