I recommend you stop using medicated Blistex immediately, my lips have been in their worst state while applying that. I found Vaseline with Aloe Vera did the job without risk of nasty reactions.
Also be careful of these "all natural" products, some may be misleading. Just don't use anything for a few months - plain water.
I noticed progress within a few weeks, but I can see why people think it's not getting better because the cycle continues but just gets a little better each time.