Yes welcome to the Diffuse Club. We're better than the other baldies.
It's normal for your hairline and temples not to recede much if at all if you are a diffuse thinner. I have great hairline and temples and most of my loss is on the top of the head, spread out.
The person who told you that propecia doesn't work well at all for diffuse thinning was wrong and misguided. Propecia works for all pattern and non-pattern forms of male androgenetic alopecia, which is what you presmuably have. In fact, Propecia should work better for diffuse thinners because although your balding area is more spread out than people who have pattern loss, chances are that your loss areas are not as miniaturized as those who are thinning in a pattern, since yours is more spread out. Sorry if that sounds convoluted but I hope you got the point.
As for treatments, well you can use all the same treatments that normal pattern baldies can you use. I recommend using Propecia for halting the bald process, Nizoral shampoo every 3 days for good scalp health, and the third part of this Big 3 regimen is minoxidil(main gredient in Rogaine). They sell generic forms of Rogaine as well. Now Rogaine is just as effective for diffuse thinners as it is for normal pattern baldies. The only downside for us is that since our balding is more spread out, minoxidil is more of a hassle to apply since we have a wider area to cover. But in fact minoxidil may be even more effective for you because if you just noticed your diffusing then your hair is probably not as miniaturized as some people's on here, so it's not as far gone, and minoxidil has a better chance at rejuvenating some of those hair follicles.
So don't get scared, stick around here, read some posts, ask some more questions, and see a dermatologist if you can to confirm that you actually do have male pattern baldness. If so, and if he's competent, he'll tell you to get on propecia and maybe rogaine as well. Ask him to write you a script for Proscar if he can because Proscar is 5 mg of finasteride and Propecia is 1. But Proscar is cheaper because you can cut it into fourths or fifths with a pill cutter and take 1.25 mg or 1 mg a day. You can save $400+ a year this way easily.
If you get on Propecia then you can expect to keep your current amount of hair for many years to come at least.
Good luck, and nice name by the way.