One of the most important aspects is emotional support, even though it can be very tough at times for those who are giving. On top of their already wrecked health, many PFS sufferers additionally face disbelief among everyone around them, including doctors. Your support will mean the world to your son, thanks for giving yours to him.
As hard as it may be, it is important to realize that there unfortunately is no reliable quick fix to this. Healing will take time, many months or even years. The good news is, as has been said before, at only one month off the drug, the odds are on his side. Coming off the drug, most men will return back to normal. At this point, his endocrine balance is very fragile and can be put off by various substances which have a similar effect as finasteride, including many natural ones. @Greek’s post above is a great starter, but there are more. When in doubt, let us know, and we can try to help you.
A last note about doctors: Doctors are multipliers of existing medical knowledge. They work by applying known solutions to known problems. As PFS is not well enough understood at the biological level, and there isn’t any out of the box (as in pharma product) solution, doctors usually don’t perform well with PFS patients, and often end up being very counter productive. In particular, be very careful with any advice to put your son on antidepressants. We’ve had many cases around here who got significantly worse by taking them, some persistently so. The reason is, that antidepressants also have anti-androgenic effects and can cause something very similar to PFS called “PSSD”.
The best thing you can do is to just give it some time at this point. With some luck, things will improve considerable over the next few months.