I don't know anything about that condition, but as someone who has had sparse eyelashes and eyebrows all my life, I've found taking prenatal vitamins has done wonders for me. I started taking them maybe a month ago and my eyelashes are much fuller and longer, and I think my eyebrows have filled in a bit more. (I also think it's sort of silly to totally shave off eyebrows to draw them back on, I just pluck off the stuff I really don't want and use makeup to shape them better when I cosplay.)
As for makeup, eyelashes on male characters generally don't need to show up. The eyeliner is really key in cosplay, and eyelashes are only "needed" for girl characters (or really girly boys lol). I've found that I really prefer clear mascara for my eyelashes for my male cosplays. I actually have a friend who is pretty much the queen of eyeliner, and I could totally ask her about techniques that would work for you. (She's super nice, I'm sure she'd love to help).
Anyway, I don't think it's being whiny, it's hard to feel bad about something you always see in the mirror. I'm still working on my butt chin issues lol...