Hang in there ! You certainly are experiencing more than you fair share of adversities. Just take things one day at a time, one crisis at a time. There really is only so much you can do. You're not Wonder Woman. You have to set your priorities. take care of the little one and try to get some sleep when you can even if it's just a short nap. I have yet to meet a parent of a baby who wasn't chronically sleep deprived.
Take five minutes for yourself when you can too. Sit and have a cup of tea or even take a nice hot bubble bath or shower. You might even want to take a short 10-15 minute walk too. These may not seem like much, but they are little things you can do to keep your sanity when things get stressful.
You have to take care of yourself. If you're sick, who will take care of your little ones ?