ermm well I have had the same problem lately, only three or four weeks ago actually. Stress is a major component in hair loss in thick hair, and I'm always stressing about everything.
Here's a couple of things I've tried that honestly has reduced the problem.
I had very long thick hair and I had an inch cut off each strand so I had super thick hair, it was terrible, anyway since I got it layered, hair loss has been much less drastic.
Also I drink about 3 litres of water a day and that helps.
I use Pantene Pro-V Restoratives breakage defence mask, it's pretty good I use a lot of it, you're only supposed to use the mask once a week but I use a trick reconmended by Erin Wasson and that's to use the mask 3-4 times a week, it really seems to help me, but I only wash my hair twice a week, because when I wash it usually takes all moisture out of my hair and it takes a couple of days to re-couperate. Comb your hair but comb it slowly, IN SECTIONS, don't try to brush or comb all you hair because several will break off, combing is good as it increases circulation in the head, but definatly do it slowly and in small sections.
Plus every morning my grandad wakes me up at 7 a.m and we do half an hours worth of breathing exercise and yoga, I'm not going to lie when I comb my hair hairs do still break (3-4 hairs now), but these things have reduced it much more, now when I wake up there's next to no hair on my pillow and fewer breakes when I comb it, normally I never reconmend products to people because everyone is different, but this Pantene stuff seems to be very good I mean once you use it and comb your hair it feels like silk and there are ZERO breakages for at for at least that day (even with heavy combing), so for me it's like a miracle product.