I am so sorry to read about your daughter's miscarriage. The only thing you can do is listen and be there for her. It is going to take some time for the both of them to get over this, but they will.
Sounds like they haven't been to great of a job w/the budget. Even though you think you are too old to change careers, you aren't. You have a lot to offer and I would consider looking around now and keep whatever prospects you find to yourself for the time being.
I'm sure you can't wait to move into Sparky's home. Once you move and get settled, maybe things will look a little better for you and the stressors will lessen.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.