Effexor 75mg cold turkey, Heart jolts?

Hey there. Ive been on effexor for a couple months now. I decided to stop taking it 3 days ago. Ever since then I've been experiencing these sudden heart 'electric' jolts/palpitations. It feels like my heart gives a really strong beat once every 5 minutes or so. The feeling stays mostly in my chest area but I also feel pressure in my ears when it happens.

Is this normal? It feels very unpleasant.