Protection from energy drain?

I just started working at a 100 year old hospital for the criminally insane. It's not physically demanding but I feel exhausted after an 8 hour shift. I get home and just want to fall on the couch and sleep but I'm a single mom of 2 and am a full time college student who has class and homework to do after work. Are there any crystals, herbs, runes....something that can keep the building and patients from sucking out all my energy?