Wow, she sounds so unhappy and uncomfortable.
It really sounds like you are doing a good job of trying to figure out what is going on.. But since she cannot speak yet, it is hard to know if it is pain, fearful, hungry or some sort of sensory sensitivity.
As parents all we can do in these cases is document everything we do for and with a child..
Start a chart of "times".. Time she wakes up time of BM or diaper changes. Time of meals, naps.. etc..
Also a list of her intake.. What she eats, drinks, etc.
Also moods. How does she wake up? How is she at breakfast? Playtime inside, playtime outside.. at the store in the car..
Obviously all medications..
Take a look at her reactions to clothing, temperatures, light.
Step back and look at her as though you do not know her and what do you observe.. Have a family member of friend come over and watch what is going on..
What are your daughters reactions, what does she seem to need?
She does have some physical things going on.. and not being able to communicate can be a huge frustration to a child this age.
Give her words.
You seem happy this morning! I like your smile!
Do you want your milk first or do you want your oatmeal first?
You seem to want me to hold you. Can you hold me hand a walk with me?
That is not a happy face! where is your pretty smile?
I like how you are holding my hand. I like your laugh.
You seem happy.
Look there is sister, give her a hug.
Sister needs to do her homework. Lets give her quiet time.
I know you are frustrated, lets look for something else to play with.
These words will help her express herself on her own..
It may be small words. Our daughter used to raise her arms and say "uppy" Or "holdyoume" When she wanted to be held or picked up
. Or she could say Scared! Or frightened!
No want. Do want.
The sleeping through the night can also take some tweaking.. Making sure her tummy is full. Making sure it is a calm in her room, white noise machine or some quiet music. A good temperature. Maybe too dark or not dark enough.
If she is teething, that really can be very painful for some children. Give her some frozen wash cloths to chew on. Is your child a redhead? Remember they tend to be less tolerant of pain.
I am sending you strength.. This is like a mystery. It will take some study and then a review of the stats to figure out what is going on.. Hang in there.. and always ask someone to help you.. On the weekends. Have your husband watch the kids, while you go to a friend or families home for a nap..