Feeling Hopeless Once Again

I've noticed remarkable changes in my sleeping routine, which are due to physical exhaustion, along with symptoms of depression.  During the middle of the day, I feel an overwhelming desire to sleep, and late at night.....I'm unable to sleep.  I haven't taken good care of myself lately, and not sure how long I can carry the "weight of the world" on my shoulders.  Sometimes, it's more than I can handle, which leaves me feeling more frustrated, and overwhelmed.  I've finally accepted that mom's illness is incurable, but there are other concerns which also affect my life.  If it were possible, I'd consider running away to start over again, but I can't.  Why is it easy for me to help others deal with their problems, yet....I'm unable to help myself???  I know that others feel the same way, but it's so easy to feel isolated.