I would like to know why i feel a flutter in my chest this is always on the right hand side and feels like there is a fish flipping over can anyone please tell me what this could be?

Your pectoral muscle is spasing in my very unprofessional opinion. If this is IN your chest then get yourself to the ER. If you can feel it on the surface in the muscle then it is your right pectoral muscle. This muscle is responsible for making your arm move forward. like punching somebody or hitting your elbows together Bench pressing is the weight lifting exercise for this.