How can I stop the intense hair shedding post-Accutane?

I was on accutane for 6 mnths, ending in Aug.2015. I started at 40mg, moved up to 60, and spent the last two months on 70. A month into the 70mg treatment my hair started shedding. It's still thinning. I have to use Drano every 2 weeks, b/c I'm shedding so much. I started w/ a lot of hair, which is my only saving grace. I'm using 2% minidoxil for about a mnth. My dr told me to use Rogaine & come back after 6 mnths. I feel desperate. At this rate I'm going to be bald in a yr. What else can I do?