Chest and back pain everyday. Ago!

I have been having chest pain and feeling of having heart attack for last 12 months and it never gone. I have visited 4 doctors (3 in emergency and 1 as a visit) every doctor has said there is no issues with the heart. I have got 4 ecg, 1 echo , 1 tmt and all came negative. All the doctors said that it is anxiety or panic attacks. Suggested few anti depressants for few days. But I am not able to come out of this and everyday I am frightened to even go to sleep or be alone or take a shower. In the recent month or so every night I have started to experience the back pain alone with the chest pain(all left side) please suggest what I should be doing and how can I proceed with the treatment. I am the sole bread and butter earner for the family. I had my dad passed away 11 months ago