More Tests & a defib!?!?

I went for my stress echo and was told they couldn't do it as they don't know whether the arrythmias are dangerous.
They did yet another echo to get measurements.  Good News -They are removing the reveal as they have found what they were looking for! not so good news - I have to go for a MRI and Electrophysiological testing which I don't really like the sound of!?
I asked the Specialist if I needed to be aware of anything or stop doing anything and he said no????
I hate the waiting arround, I wish they could just book you in for a week, do what they need to do, sort you out & send you on your way!!!
NO HOPE!!
Depending on the findings of the tests I may have to be fitted with a defibrilator, dont really like the sound of that either.
I have been quite relaxed about it all so far, but am starting to worry a little now!!