[ccleve]

Sudden onset mental health problems can have a physical cause. It's very important he have a thorough medical evaluation.

Find the best place that you can to do the eval, and absolutely insist that they do a very detailed workup. A lot of doctors are dismissive of mental health issues. Find a good neurologist, and then push, push, push to get this done.

If you make it happen, you'll be the best friend he could ever have.