Thanks for writing your query.
After reading your post, it seems that you are suffering from Gastro Esophageal Reflux Disease
It is caused due to increased acid secretion in the stomach and its reflux towards the esophagus
and mouth, resulting in sour and bitter taste in the mouth.
You should get investigated for H.Pylori and consult a Gastro specialist.
You can take Omesac 20 mg along with Domperidone
10 mg early in morning for relief of symptoms.
You should take medicines under medical supervision only.
Following some precautions will prevent recurrance, like :-
1. Avoid spicy and oily foods
2. Donot miss a meal
3. Avoid emotional/mental stress
4. Avoid Ciggarate/Alcohol
5. Avoid self medication
, especially with pain killers and steroids
6. Drink plenty of pure water
I hope this is helpful to you.