Yes - I get palpitations and increased tinnitus with anxiety.
If I know whats causing the fear (which I don't always), I now try to stay with the fear and talk myself through it as opposed to trying to trick my brain into thinking of something else. It doesn't always work sometimes I dissociate without knowing, sometimes the fear and anxiety is too much and I have to find a distraction.
However, by staying with the fear when I can I am hopefully desensitising my brain of the fear. A little like going on a roller coaster time after time until you've got used to the ride! With some triggers I am having some progress, but then its easy to fall back again.