Older, Not Eye Candy, but Highly Experienced & Credentialed

I am a certified professional paralegal, with many years under my belt. I have advanced to my professional organization's certification board as a question writer (we write the books and exams for certification). I'm also 58, age has not been kind, and I have some health issues (specifically, 2 heart attacks, Stage 2 Chronic Kidney Disease, Thyroid Disease and Fibromyalgia). I do NOT share my health concerns at work, unless absolutely pinned to the wall. I don't require a health benefit - my husband is retired military, and I'm fortunate enough to be on his plan. All that being said, we just got married last Christmas Eve. I moved to his home, from Arizona to Indiana, and was fortunate enough to negotiate a deal with my then-employer for part-time remote work with him. That has been great, but have still needed extra income. I was able to get a job in June, but was fired 27 days later for being "too slow" (2 attorneys, filing, phones and reception work!). I was finally able to secure another job starting Tuesday, November 12, with a 30 probation. I was told, several times, that if I saw anything that could be made better, go ahead and do it. This was for a partner in a firm - an elderly partner. The first day, I went in with my cane because we had had a heavy snowstorm and the sidewalks were very icy - I didn't want to fall. I started getting questions about my mobility from this partner, and just told him the sidewalks are icy and I didn't want to fall. That raised some red flags with me. Wednesday was okay. Thursday, remembering I had been encouraged to take the initiative, I started cleaning up the computer. Friday, I was fired - precisely for taking the initiative as I had been encouraged to do. Their ad has now been on Indeed since the 15th - seems they're not getting a lot of response. When we married, I told my husband it would be difficult to get a job 1) in the small town we live in - only 11,000 people; 2) at my age and 3) precisely because I'm NOT eye candy. I still work remotely for my Arizona employer but they now have a part-timer who is destroying the practice. Because she was hired by one attorney, the other attorney is hands off - the one I work with. We still need the extra income, so depression has set in - 27 days at one job, 3 at another. In hindsight, the questions regarding my health on the first day should have alerted me something was up. I suspect the partner was looking to fire me from that point, but couldn't do it legally on health issues, particularly since they weren't covering me. The initiative issue proved convenient as he could say I mis-interpreted what he said in the interview. How does one handle this kind of rejection when it seems bosses would prefer eye candy and no experience, to seasoned and well experienced (I don't like "senior" but prefer "seasoned"). How do you push on and get through it? This kind of rejection?