"Is this all there is?"
I truly understand what you mean. I constantly asked myself this through my first attempt at sobriety and came up with no answer only to end up relapsing after six weeks. "Normal" life is banal/mundane, full of anxiety and irritations. Which if your anything like me was cured temporarily by using mind altering substances to dull the feelings.
However I do believe that your negativity will reduce as each day goes by, at day 6 you may still be suffering physical withdrawal, the mental situation may take a while longer to abate but it certainly will.
From then each day of sobriety will deliver more gifts than you could think possible. The ability to unwind by doing banal things like reading a book, watching TV, talking to friend will then seem commonplace.
We took ourselves down a long path searching happiness but it only delivered sadness, it's a long way back but must surely be worthwhile.