I'd recommend just getting him to an appropriately trained mental health specialist (either a psychologist or psychiatrist, both of whom have doctoral level training in psychodiagnotic assessment) for a good diagnostic workup. Both will work with your PCP to develop a treatment plan once you have a better understanding of what is going on. ADD/ADHD are both lifelong neurodevelopmental disorders that are present from childhood, and do not have a sudden onset, so it is unlikely that this is the issue (or at least not what is tipping the balance here, as if he does have it, he would have had it all his life). OCD is also typically more of a lifelong issue, and also does not have a sudden onset (and it would be obvious to a mental health professional if this was the issue). OTOH depression, panic disorder, and GAD can be triggered by stressful life events, and you'd want to rule out anything physical as a cause of his symptoms (which his PCP should already be working on). No-one can diagnose without a thorough work-up and an actual examination, so please don't think you can just get opinions here and read up on stuff and figure it out on your own. He needs professional help. Most therapists aren't trained in the kind of differential diagnosis required of more serious mental health issues (the focus of their training is typically on helping people through relationship issues or normal life stresses, not more serious mental health issues). Once you have a diagnosis, the treatment plan will be more clear. For depression and anxiety, CBT and medication management of symptoms (in combination) is typically the standard of care. Usually people work with a psychologist for the CBT while their psychiatrist or PCP prescribes and monitors the medication management part.
I know this is scary. It will be a lot less scary once you have things in place in terms of diagnosis and treatment. Things often get better pretty quickly after that. I hope he feels better soon!
I know this is scary. It will be a lot less scary once you have things in place in terms of diagnosis and treatment. Things often get better pretty quickly after that. I hope he feels better soon!