How to allow emotions ?

I realized I have a lot of issues because I am not allowing emotions…
At the moment, I am trying to avoid fear.
And yet, all I feel is fear… Why is that ? And how can I stop feeling fear ?
I am having a surgery on Friday and I keep on freaking out about the anesthesia, the outcome and the recovery period…
I would like to be able to fast forward all that and be in the moment when I feel better, how can I do that to change my mindset ?
Thanks a lot.