Ed, from your other brother Ed, what you describe is fairly common from radiation on, for life and even sporadically. If you like to read, read about the H-P-A axis. It's not clear if it's the trauma of everything in cancer world being cumulative but ongoing stress triggers a lot of chemical reactions in our blood.

As the body adjusts, the data to the brain and the instructions from the brain travel through severely damaged nerves from radiation. Find a good family doctor that analyzes blood to determine health status and as the body settles, try and keep track of how you feel and what the labs say. Things may feel fine but be skewed but it also helps in pinpointing strange things happening. What was normal before may not be the same.

Do you eat a lot of soy products by chance? That can increase B12 and also lower LH hormone levels that are used to produce testosterone. I stumbled on that once and once taking Megalace when I lost intestinal motility. Both a heavy soy diet and Megalace did the same thing. Here's all the high B12 foods: eggs, milk, cheese, milk products, meat, fish, shellfish and poultry...pretty much everything I eat. I have to keep track of my B12 regularly.

I started taking D3 in the winter about 5 years ago because of a sudden drop. I really stay on top of that for many reasons mostly because it makes me feel better. I use drops in my (feeding tube) breakfast blends every day, 5,000 iu now, up from 3,000 for a long time. I have most things checked every 3 months. My last set of labs were the best in 30 years even being on a feeding tube for 9 months. My LDL was 106 and fasting glucose 109 with everything else fine.