Re: Can severely low TSH cause psychosis?
Since I "talked" with you last night, I did a little research into your situation. The short answer is definitely yes. The suppressed TSH might be caused by a pituitary adenoma, which is a benign tumor that suppresses the TSH.
I easily found an article written by the American College of Physicians that describes a case of an 'otherwise healthy' 30-year old with unexplained psychosis who was found to have such an adenoma which was suppressing the TSH. They go on to say that pituitary adenoma presenting initially as psychosis is extremely rare and unusual.
But clearly, it is not impossible.
An MRI will be needed, and a prolactin level run. The woman described in the above case had one MRI done, which didn't show the adenoma; a second MRI revealed it after it had hemorrhaged and was easier to see.
If I were his mother, I'd grab onto this possibility like a pit bull and not let it go until a professional investigated it seriously. You will meet lots of resistence from endocrinologists who don't like to be told their business. That's their nature. But it's vital you push this issue until you get an answer. And I would surely not wait 4 months, either.
I hope you'll let us know what happens. Good luck to you both.
"We can complain because rose bushes have thorns, or rejoice because thorn bushes have roses." Abraham Lincoln