Whats symptoms causes persistent couphing at nights, persistent sweating and at rare times increased heart beat for no reason?

Night sweats: Night sweats and cough can be caused by a number of pulmonary infections including tuberculosis, additionaly reflux with aspiration and simple thing like post nasal drip. Requires medical attention to go thru diagnostic evaluation.

Cough at night: Several reason. Most common one is due to asthma, allergy, bronchitis and postnasal drips. Heart failure (which I do not expect in 20 year old person) also is on the list. Please talk to your pcp.