Urge for a deep mouth breath. Help me!

I constantly feel sudden urge to take a breath from my mouth that causes fullness of chest and that breath feels incomplete. I have taken ecgs again and again it results in incomplete right bundle branch block and sinus Arythimia I am very scared my lipid profile is normal and my echo as well not taken a tmt because my doctor is not able to find what it is. My nasal breathing is fine but i still feel and urge to take a big breath my chest xray is also fine i am unable to figure out what is this. I too tend to feel my heart beating fast at times . Please help me in this i feel dizzy at times and neck pain as well and a lump im my throat and sometimes pain as well in the throat Tests such as Ecg Chest xray Echo Cbc, lipid, lft, rft All are normal what it can be can u asist my left hands finger feel tremors and arm pains as well Help i cry to sleep its very discomforting i have consulted more than 7 docs help me