"FFS" in full and loud is my most used expression at the moment. Every last little thing irritates me for no obvious reason. I think that it's because my blood is now flowing cleanly through my body rather than being dulled by the alcohol and as others have said, it seems pretty common.
You could ask your GP to check your blood pressure which may be contributing. Other than that maybe you need to find an outlet... Obvious choices being gym/swimming/boxing/yoga etc but everyone's different. And if necessary just come to SR and vent... It can be very cathartic!
Best of luck.