I am no expert but it sounds like something to do with the artery if it was mentioned. Why don't you make an appointment with your GP and go armed with a written list and ask that question...it's your right to know what you are dealing with...and it may be something less worrysome and he can put your mind at rest !
That is one thing I get so annoyed at...they know we get confused and forgetful so why don't they write it all down on paper before you leave in a way that you can understand what the problem is !
Best of luck for a happy answer