Thanks for writing us..
Symptoms which you are telling are more related to arrhythmias( irregularity of heart beat)
Usually in your age heart attacks are not seen and your red spots over chest are not related to your heart condition..
You get a ECG, ECHO, HOLTER MONITORING to diagnose exact condition and get THYROID
Try to get ECG done at the time of symptomms.
These are treatable conditions, Dont worry
Get back to me after investigation I would be happy to help you