@outlander, it's wearing. It doesn't matter how much you love the person you care for, there's still times when it gets too much.
I've ended up on DSP for persistent depression, which is the logical end result of repeatedly dealing with problems that don't go away. This is despite supportive family, friends, GP and a psychologist (plus forum...) giving me back-up. And I'm not someone who easily gives in to negative thoughts. (You may have noticed my tendency to find the funny side to things. That's me- I like a laugh. "Persistent Depressive Disorder" sounds like a totally out of character diagnosis.
)
So never ever feel bad about getting support, and don't feel like a failure at the times when it gets on top of you. Much more likely that you're a strong person who's been working at their limits for too long. You and (very proabably) all the rest of us here too. xx