Really?

pulsating through the veins,
a wretched feeling that grips
my throat,
raising the rate of my heart,
a thought,
a single thought exploding into
the very mechanics of my subconscious,
a raging anxiety that separates me
into complete isolation.
completely alone with this disease
of absolute uncertainty,
a very dark place that swallows
my ability to believe,
faith shaken at the core.
who am I,
Really?