Hi. I can feel completely well but then suddenly get excruciating pain in the dip above my collar bone on the left side., it gets so bad, it hurts to breath, I can barely move, specially my left arm, every movement is agony, leaning forward makes it worse and I get flu like symptoms with it, aching all over, sweating, headache. I don t feel any pain in heart area. It has happened twice now. It is quite frightening, I am 52, 5 2 and weigh six stone. Had ECG not long ago and they said my heart is fine.