Chest pressure and breathless in night.

Dear Doctor, Medical history :I have acidic reflux and anxiety Height-5, 11 Weight-106kg Last few months the situation facing by me is really horrible... during the night time or early hours in the morning like 1-3 am suddenly i got wake up with chest discomfort like chest pressure and chest tightness including breathlessness...after sometime slowly it calm down and getting sleep. At that time i have checked oximeter my pulse rate and oxygen rate is normal. Since January 2020 i have undergone tests like bp, sugar, cholesterol, tmt,ECG, 2d-echo, chest x-ray, pulmonary function test but all the reports are normal except HDL got bit low around 28. Hence kindly advice with your valuable comments and let me know do you want me to include any tests or suggest me to repeat any tests