I would speak to your obgyn about this matter and see what he.she suggests in helping with your hormones. It is very understandable that you are feeling a flood of emotion for your MIL and being pregnant on top of that I can only imagine how magnified those emotions must be. Turn to God at this time. He is so awesome in power and can fill you with a sense of peace when you need it most.
My friend just lost her close friend (this morning actually) to stage 4 colon cancer and posted this beautiful poem on Facebook. Even though your MIL has not passed, this poem is an attitude we should all have when faced losing our loved ones and even while they are still alive. Every moment is so precious and goes by so very fast:
You can shed tears that she is gone
or you can smile because she has lived.
You can close your eyes and pray that she'll come back
or you can open your eyes and see all she's left.
Your heart can be empty because you can't see her
or you can be full of the love you shared.
You can turn your back on tomorrow and live yesterday
or you can be happy for tomorrow because of yesterday.
You can remember her and only that she's gone
or you can cherish her memory and let it live on.
You can cry and close your mind, be empty and turn your back
Or you can do what she'd want: smile, open your eyes, love and go on.
~
David Harkins
I hope this helps. God Bless you and I will be saying a prayer for you and your family!
A.