I have bought antimalarial drug and typhoid drug amoxicillin plus cough hav taken it finish but still any time i woke up i notice that my mouth is bitter this has been happening for years don't know what is wrong with me

All this you mentioned is still self medication.... why don't you go to an hospital for proper medical check up.. let the doctor diagnosed you and tells if where the problem comes from and what to avoid

You are suffering from acid reflux which is caused by build up of acid in your stomach, the best solution is to mix raw akamu in ordinary tap water and drink it 2 hours before lunch and before bedtime
In one week you won't feel the bitter taste in your mouth, i used to experience it before but i no longer experience it again