Dragon, you don't sound horrible at all. You sound human.

Many years ago, when my kids were little(we have 4), my dad was diagnosed with pancreatic cancer. My folks lived an hour away, my mom fell apart and I thought at times I was losing my mind, running back and forth, working and raising the kids. I didn't know who to give my attention to first and I was so tired all the time. I'm guessing that is what you are going through.

What helped me was to remind myself that I was only one person and I could only do so much. No one (except my awesome husband) was going to say "stop, you are doing too much." I had to figure out when I needed breaks and GIVE MYSELF PERMISSION TO TAKE THEM WITHOUT GUILT!!!
Try to take it easier on yourself and keep coming here for support.