I have accelerated loss in my temples, especially right and I just emailed Dr. Lee about this yesterday, below is his reply to my email in case you are interested:
From your brief description, there are three possible explanations for your hair that is thinning and falling. (1) telogen effluvium (2) acute accelerated onset of male pattern baldness or (3) a telogen effluvium that sometimes heralds the onset of male pattern baldness.
A telogen effluvium would be explained by a shedding of the hair "all over" the scalp, including the back and sides, which are areas not usually affected by male pattern baldness. The inciting event for a telogen effluvium, such as your period of severe stress or systemic drugs, usually predates the shedding by approximately 100 days. If your hair loss were due simply to a telogen effluvium, all of the hair will grow back.
male pattern baldness can have a sudden and explosive onset, such as you have described. Although not common, there have been reports of physical sensations (e.g. itching, burning, redness, etc.) in the affected areas of the scalp accompanying an accelerated phase of male pattern baldness. In this case, the hair will grow back, but the thickness of the hair may be dramatically decreased.
Then, there are cases of telogen effluvium that begins a period of accelerated male pattern baldness. This would be the worse case scenario, because there is sudden excessive shedding and the hair follicles, which shed their hair shafts, will miniaturize and replace the hair shaft with hair that may be vellus-like.
For any hair loss treatment the work requires a norm of 4 to 6 months. The reason is simple. What we are trying to do is to replace thin or fine hair shafts by thicker ones. In order for that to happen, the follicle producing the fine hair shaft has to shift into the telogen phase, which lasts ~100 days, shed the fine shaft, and start growing an observable thicker shaft. That requires 4 to 6 months, regardless of the treatment. That is one reason you have not seen a response to finasteride.