I've also been on Rogaine foam for 4 months. No regrowth as of yet, but it may take up to 6 months or so I heard. I am also a diffuse thinner, but have only been balding for for about 20 months now at a rapid rate. I am starting to get worried that Rogaine just doesn't stand a chance against...
So you quit and after several months your hair becomes thicker? Is it possible that your hair took that long to respond and your thickening after quitting minoxidil is just a coincidence?
What other treatments are you using in addtion to Rogaine? I have been using Rogaine foam for exactly 4 months with no regrowth. My hair is getting worse and worse every day. I guess I will have to wait and see.