The Bible says that what makes a Christian different from anybody else is his attitude toward the little things. The Bible says if you have an attitude of being a grateful, positive person and not being a complainer, you will be so unique that you'll stand out like a star in a dark night.
When I get irritable, it's simply a warning signal that I'm not in tune with God. When I'm in tune with God, then I remember God is sovereign and God has everything that's important under control.
Therefore, I won't sweat it! I realize I'm in His hands. "Being confident of this, that He who began a good work in you will carry it on to completion unto the day of Christ Jesus." (Philippians 1:6 NIV)