Each is unique in situation and consequence, some share advice that may help or might add more confusion, when it is a health issue finding answers is never easy.
I hope you are able to find an answer to the problem, experience in living with a son who suffers hidden ailments, almost four years on, we still looking for answers.
You're right, when it comes to sick or depressed people it's never easy to do or say or have the right thing to say. It's always difficult, but well... I guess that's just how it is and we might never get a solution.
We have cottoned onto someone who makes sense of many strange things we never thought about perhaps give him a listen if you have time, English YouTuber and retired nurse educator. Mental health, Mental illness - Dr John Campbell