What Causes Anxiety Along With Tightness In Chest And Palpitations Of Heart?

I have been to two heart specialist and I do have an insignificant murmur is what I have been told. I am 59 and my daughter is 40. We have almost the same symptoms. I have taken levothyroxine all my life for hypothyroid and my daughter has thyroid symptoms but never do the test show that she needs thyroid. Our symptoms are tightness in the chest, palpitations which can cause both of us to become anxious and bring our blood pressure up. Tightness in the throat or the feeling that you are having trouble swallowing. Pain in the back by the shoulder blades and a feeling that we cant catch our breath. I have been diagnosed as prediabetic since they did an A1C but I am now eating a strict diet, not on any meds, stopped all caffeine drinks period and I am feeling better. The episodes as my daughter and I like to call them are going away for me. My daughter says she just feels so tired after one of them and so do I . On one episode I had my blood pressure was 209/198 and my head went numb. But like my daughter I can wake up and feel good then all of a sudden I feel tired, my throat feels funny, my heart feels like it just dropped to ground and I feel I need to catch my breath. We have both been to Dr.s and really haven t found out anything except what they found out about me. Could you help us, Please.................