I have been having fluttering in legs. This started above left knee five days ago (could actually feel something ball up with my hand and move a few inches), then bottom of left foot, then left calf, now in both legs, feet, calves, thighs, and right hip. Random pains that come and go in various places mainly in right leg, right arm, and as of today outside of right wrist. The tech didn't see anything in my Doppler of both legs yesterday. I have a slight heart murmur. Sometimes right leg is colder to the tough by quite a bit than left leg. Getting really scared as the fluttering and aches are in increasing and becoming more wide spread. What could this be please?