It's amazing how sobriety stages can be so similar for so many of us. Weeks 1& 2 physical issues, weeks 3 & 4....BOREDOM. I'm on day #25 now and am going thru the same thing as you...life can seem slightly grayer around the edges. I'm told this is only a phase.
Keep your mind and body occupied. Pick up a hobby; resume an old project. Let's find out when the days of sobriety are interesting again.