Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain there is a probability that the bitte taste in mouth and phlegm formation especially in morning can be due to Acid reflux as many people suffer reflux of acid at night more commonly due to posture which facilitates easy reflux..
You should consult an Otolaryngologist and get evaluated and in case of acid reflux he can refer you to a Gastroenterologist and can advise you Upper
G.I Endoscopy for confirming the cause..
If there is acid
reflux Medication like
Proton pump inhibitor like
Pantoprazole or Omeprazole or
Rabeprazole will help..
Taking antacid like
Milk of Magnesia before meals..
Drink plenty of water..
Avoid spicy and acidic foods..
Take small portion of food every 2 hours..
Take your dinner atleast 2 hours before sleeping and take very light meal at night..
Sleep with head slightly raised as compared to feet..
Recline in left lateral position..
Of your are overweight try looking some weight..
Hope this information helps..
Thanks and regards..
Dr. Honey Nandwani Arora.