I can't breath from nose cause of my cough and mucus , the scary part is aside from that i'm having irregular heartbeats. no chest pain. is this bad?

Insufficient data: R U febrile? U appear to have Flu symptoms or bad cold. Medicines for cold can cause irreg heart beats, & it is good to know what rhythm is on ECG as well as what meds U R taking. You should see an internist. ASAP. Afrin (oxymetazoline) (generic avail) overcounter spray should help clear mucous(only spray sitting up). Little systemic effect, but use gingerly, you nose can become addicted (ie,only clear w afrin).