I can readily identify with health anxiety. I think it is one of the menopause's many manifestations for many women. The internet definitely has not helped. You can scare yourself into panic mode by researching too closely on it.
I am glad you have a supportive helper to counsel you. It is such a relief to be able to unburden without relationship issues getting in the way and objectivity is a great quality when discussing any form of stress or stress related illness.
For myself, I have found great solace in music. Have you considered taking up an instrument? You are never too old and, if you choose one that can be played as part of a group, that, too, can help a lot.
When I lost my the last of my dear sheep in 2013 and, although I have a good marriage, I went through a very bleak time. My husband's kidneys failed and he had to go on dialysis. The adjustment to this for both of us was very difficult and, for several months, I lived virtually as a widow. I joined a brass band for beginners though and have come through a dark tunnel clasping my euphonium!!
Whatever you feel might help, go for it. I wish you well.