hi i have read your question actually in medical terminology it is called as palpitations now there three important things when u dealt with palpitation first whether your palpitation was regular or irregular? second what thing precipitate your palpitation? eg coffee or energy drinks third are there any symptoms related to palpitation ? chest pain,dizziness REASONS FOR PALPITATION 1) hyperthyroidism 2) atrial flutter 3) atrial fibrllation 4) sinus tachy cardia 5) some drugs or substance abuse 6) anxiety now if your weight decreasing despite adequate diet , u have excessive sweating or tremors than go for TFT get an ecg done preferably during palitation avoid precipitant factors for example coffee if prelimanary investigation fail to diagnose than you may need holter monitoring hope answer your question for further query you are most welcome thanks