What Causes Discomfort And Sleeplessness After Taking Metoprolol And Flacainide?

I was Amiodarone for a few months for my heart problem and ended up with a tickle cough, phlemgn, and retching. It did clear on its own but this week (after a couple of months) it has returned.I am now akin Metoprolol and Flacainide for my heart problem. Feeling dreadful and cannot sleep, can you help me please. Ann Challenger.