Having many heart palpitations but confirmed no heart problems. what next?

Get thyroid checked: If it's not of primary cause, and your heart is OK then look at secondary cause, and thyroid is often implicated, and can cause palpitations. Also have your doctor run labs and check your Magnesium (Rbc), vitamin D3 levels and vitamin B12 to make sure you are not demethylating, and not insufficient in trace micronutrients, and vitaminD. Magnesium is necessary for the heart.

Palpitation: Stop all the stimulant like Alcohol, caffeinated beverages and Nicotine, try to treat any anxiety you might have. Make sure you Thyroid and Electrolytes are well balanced. I don't know what you mean by no heart problem but I assume you have no structural heart disease like valvular problem, have you done a 30 day holter monitor called Zio patch? If not I believe you should benefit from Zio patch.