Hello. Am Female aged 38 and otherwise good health. Experiencing some weird symptoms on and off for the past three years. Started first when I was a few weeks pregnant with my last born (2021 - mid COVID era) and started getting breathless and then suddenly one night woke up with palpitations and dull pain on left side shoulder and chest. Wasn’t a full on tightness but very hot and cold sweats. Went to emergency and they did all heart checks. EKG, echo, ultrasound. All tests were seemingly fine except blood test showed slightly elevated Troponin levels. Doctors didn’t seem concerned but palpitations and dull pain continued for a few weeks especially at night and when lying down. Then symptoms disappeared for two years. Then appeared again last year (2023). Same time of year (Feb - winter). Same palpitations, dull pain and breathlessness and again goes away after a few weeks, usually when weather gets warmer. Same again in later 2023/2024 but after a very bad flu/ virus. Palpitations strong at night, dull pain that comes and goes around chest and upper breast, shoulder and arm. Sometimes feels like heartburn. Not constant. Worse at night. But feel more breathless and sometimes light headed. Pain around shoulder blade and back of neck. Chest xray clear. ECG and echo were also clear. Some relief with Ibubrofen and hot and cold therapy. Doctors don’t seem overly concerned and no clear diagnosis but I’ve not slept in weeks and the pain and breathlessness is not going away at night especially. Any one experienced the same?

Edit. Weight is 58kgs, otherwise healthy. Have history of poor stamina and also have vasovagal Syncope. Any Advice?