Heart Problems?

I do not fit the typical profile of a person with possible heart problems. I have always been active, I have never been overweight and have eaten well for a long time, mostly organic foods, little meat and dairy. Never smoked or was a heavy coffee drinker (one a day) and had about 2 - 3 cups of black tea a day. Hardly ever drink alcohol and if I do very little. Cut most sweets out a long time ago and have been without refined Sugar for 6 weeks now. Also no more coffee, black tea either. I have had issues with my thyroid and adrenals for a long time . Armour thyroid helped, but I was never 100%.

About 6 weeks ago I started taking Iodoral and was up to 6 tabs a day when I had a rather severe reaction, heart palpitations and what seemed like skipped beats, tightness in my left chest, very stressed out and my body temperature dropped. I did not know this could happen and that's when I found this forum. I understand that those were probably detox symptoms.

I had my heart checked out (EKG) because I did not know what was going on and was told it was OK. Blood pressure was its normal typical self too (usually have 120/70 or so).

After learning more about taking Iodine and its possible reaction I focused on supporting the detox symptoms more and started to take more Iodine again, slowly building it up, but again those detox symptoms would creep in.

I stopped taking the Iodine and still feel the tightness in my left chest, plus some minor pain once in a while. My energy is still somewhat low too, yet I was able to trim 4 horses yesterday and lug some heavy loads around without getting shortness of breath per se or any unusual coughing.Hav nnot had the feeling of palpitations or skipped beats though.

Per the doctor's recommendation I'm scheduled for a stress test. Would that reveal anything if something else was going on?