I admire each and every person who has to function when they are experiencing a severe OCD attack. Living with OCD can be both mentally and physically debilitating. It zaps you, drains you, leaves you exhausted and depleted. Added to this is the fact that OCD is often embarrassing, and people suffering with it go to great lengths in order to hide it. The combination of these two things can be very draining on both mind and body.
If someone you know has OCD and feels like this, it could help them a lot if you were aware of this. You will then understand if they appear edgy, tired, or impatient. There is a certain comfort in understanding.