"...I couldnt sleep but was just lying quietly as I used to before.
I cleared my mind.
Whatever thought came into the head any flash of anything i would just blank it out and I became a blank.
I felt a sense of power, of being back in control of my life.
I had lost that feeling for a long time."
When you break away from all that is earthly you are left with only your soul - and strangely it makes you feel immortal and strong rather than weak - which means you feel you will live forever (your soul will) - and hence there is nothing to be scared of.
Instead of feeling like you are losing something you feel like you have gained something when you give up, and forget about, earthly life.
That is proof that the soul exists if it is true for you too. Is it?