I have this tight feeling in chest and throat especially lying down. pls tell me what it could be. very unpleasant?

Several possibles: H question is relatively broad and it requires more information and certainly an examination and testing. The possibilities range from fluid in the long because of a heart problem to anxiety panic attacks. Age dependency helps to guide what it might be.Gastroesophageal reflux is a common cause as it is early heart failure and asthma as well. C an MD for accurate diagnosis.