Sorry to hear you are having a stressful time. I have been too and here are some things that are helping:
Take a multivitamin. I eat badly when I'm tired and stressed, and a vitamin makes a big difference to how I feel.
La Roche Posay is really good skincare range, it was recommended to me by a dermatologist friend and it is great stuff. They have ranges for so many types of skin - there must be one for yours. Its in a lot of larger boots stores and mid range in price.
There are a lot of concealers especially for under eye circles. Bobbi Brown do a good one and so do Benefit. Maybe you could get to a dept store with both brands and get them to conceal one eye each so you could compare and contrast 
A really pretty lipstick helps too, I love the Dior Addict ones, but I had a Boots voucher recently so tried these and they are just as nice as the Dior, and I got 3 Boots ones for the price of one Dior, so one in the bathroom, one in the car and one in my bag!
I love Lisa Eldridge, she is in her 40s and looks stunning. I love how she looks a bit tired and washed out at the beginning of her videos and gorgeous by the end. There is hope for us all
I find it really hard to sleep at night when I'm stressed, it's hard to shut my brain down. A brilliant trick that really works is to count backwards from 100. If your mind wanders off go back to 100 again. I have trained my brain to fall asleep before I get to the 70s
I hope some of these are useful and that life gets a bit easier for you soon 