I hear my heartbeat and hear something weird

I have what is called pulsative tinnitus. Most of the time I just hear my heartbeat beating normally kind of muffled in rhythm and I don't like it but well I don't really have a choice but there are times my ears stop up and I can really hear it.. so clear its a bit scary . It will beat lub dub lub dub lub dub then it beats like this lub dub lub dub lub dub lub lub a dub lub lub a dub lub dub lub dub lub dub dub luh dub lub dub .Its almost like a gallop.

I have listened to many heartbeats online from heart specialist and cannot find any that sound exactly like mine.I have looked up all the symptoms of afib and irregular heartbeat and I don't really have any of them exactly except I do get missed beats but think that has to do with stress and also I get what I think is a little breathless but then again I think this has to do with anxiety too.. So overall I don't have the major symptoms of irregular heartbeat ,afib or heart problems at all.So am I just paying too much attention to the sound when in fact there probably is nothing wrong?

hmm guess nobody ever gets this except me.