I went out for a work night out last night and am now having really bad palpitations and racing heart. Had checks done and there is no underlying?

Probably monitor. Would consult with a cardiologist Could wear a holter monitor for 24 hours or if symptoms are less frequent could wear an event recorder for 1-4 weeks This could determine what the rhythm is when you experience the palpitations. Would also have bloodwork to check chemistries and possibly thyroid function studies.