This is an excellent reminder to care for one's self. It's great that we yearn to help others, but when it comes at a cost to our energy, quality alone time, and well-being, it's probably a sign it's time to set some new boundaries for yourself.
I know this from being a lifelong nurturer and naturally helpful person. You can burn-out very quickly if you don't pay attention to your own needs.
It's not selfishness. It's a healthy understanding of what we're really capable of.
I've found the blog articles published here at Psych Central to be of great help in this area. For instance:
Compassion Fatigue (not just for nurses!)
Hugs, y'all.