Stress
The pay is low, the hours are long, and you have to deal with impatient sick people all day.
Yeah, you could say this job is about as stressful as playing poker against Keanu Reeves.
To be fair, stress levels will also depend upon the environment you are in and the hours you have to work. Many pharmacies actually have very restricted hours, and close as early as 5:00PM. The amount of other pharmacies in the area will affect how crowded yours becomes. Crowds can lead to angry mobs pretty quickly. People are especially unruly when sick and trying to get their pain killers.
Do your best to stay positive, patient...and focused on the fact that you are probably moving on to something else as soon as you get your degree.