Not stress, usually blepharitis.
JCH III IMD
I know it has been a long time since your post, but I wanted to comment in case you are still having trouble. I have been going through a very similar situation and recently came across some information about chronic blepharitis and low testosterone levels. (Yes, even women need a certain level of testosterone.) It would make sense in your case that the pregnancy/difficult labor could worsen hormone imbalance, as could other stressful situations. Have you ever had your hormone levels checked, including testosterone? If not, do it! Mine, like so many other women, was totally in the toilet. I've started bioidentical hormone replacement (much safer and without the side effects of the chemically created hormones) and am for the first time in two years hopeful that the mess with my eyelids is ending. Just make sure that testosterone is part of the regime (not just progesterone and estrogen, as increased estrogen without it will actually make the problem worse). Testosterone levels are directly linked to a keeping your meibomian glands functioning properly.