Congratulations to your son on his graduation! I'm sure he's glad he's out of school and can move on to doing actual social work. If he is anything like his mom, he will be a success in his field.

I think you might be on to something with CMM. He does tend to obsess more than most who are OCD.

Have they thought that he may be passing blood or bleeding internally and losing the iron that way? I hope that they can figure things out for him so that he'll feel better.

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.