Heavily increased facial White Hair. It?

I'm experiencing a massively increased white hair growth on my Face and chin from about past 6 months. From more the past 2 years, I was on heavy doses of Neuro medicines (Tegretol,Eslizen, Pregabid, Antidepressants and a large set of similar medications) as I was suffering from a severe neurologic pain throughout. Now that problem is cured and I've stopped all of those medicines but my White Hair growth in face has increased in the last 6 months. I'm not sure if this is a side effect of the medicines I took for more than 2 years but the growth of white hair has significant increased in past 6 months. Note that I've already stopped taking all the Neuro medicines described above and I'm not taking any medicine at the moment but still white hair growth is increasing. Please suggest if it is a side effect of the medicines I previously taken? Or there is no relation to it? And what should be my next steps towards this problem. Thanks!