Doc this is the hardest part of life, having to depend on family (if people have family) but your son needs to be a big part of your life right now. I know the timing may seem wrong with him and his happy new life, but you need him. I have a family member in your same situation that I'm having to care for so I know it's not something you would want to ask of him. My family member did not want to put me in this situation but it was critical and necessary...nowhere else to go. Plus I have an elderly parent and older friends that are widowed. It's part of life and the order of things to have family do the best they can for you. And yes, it eats into everyone's comfort level...but it's the right way to go.
If you must, move closer to him so he can manage his time better to see after you. A few years ago my Aunt would not come home with me to care for her. I had to leave my family and live with her for a couple of years and it made it so hard on the rest of my family that needed me at the time.
You may find a job tomorrow or may not find one at all. It can be tough for anybody right now. I'm sorry you lost your practice. Those type of things make me feel so lost when it happens to me. I'm bad about questioning whether I'm in God's will or not. Always wondering if I was listening to Him close enough...or was this just the avenue that He was taking me to get me to my next learning experience.
You are not alone Doc. We all suffer hardships...although it may be different hardships for different people. We must believe that God is still in control and we move forward in His name asking for sound decision making in such matters.