I understand where you are coming from.
I hope this will help:
In this Modern World, we do not provide an understanding of what Fear is and where is is rooted in our self.
Fear is generated deep within the foundation of our Brain. It is structurally part of the Flight or Fight response. That response is one of the hardwired basic responses.
Fear is a 'feeling' that is generated in advance of the selection of whether to more away from or to act upon the what we are confronted with.
Once one understands what 'fear' is and instead of freezing, do something fear has no foundation and that 'feeling' stops. The term 'nerves' or 'nervous' is what we feel, but it is in fact fear.
It comes to having taken the time to understand, to use the knowledge needed to make that choice!
So, Fear or to use your word Nerves is simply the expression of yourself not making the choice that sits in front of you.
In this Modern World, rarely do we have to make a life or death choice and as a result, we lose the ability to act upon the information we have and quickly choose. We freeze and that only enhances the fear (Nerves) response. The longer we freeze the worst it gets! This ends up being a self induced cycle that only supports freezing for longer and longer time periods. At some point, we physically and mentally shutdown!
Point being, one can continue to circle the choice or we can make it. It may seem easy to say, but harder to in fact do it!
You have come a long way from where you had been. The reality is that regardless of our want; Bad Things Happen to Those That We Love! We do the best we can to avoid that happening, but we must understand that there are things that we have no control over!
Take a deep breath, clear your head of the fear and simply choose! If your fear is too high, than choose to step-back and wait a bit longer!
Whatever you do, Do Not Get Locked Into A Circle!
Hope this helps!