I am so sorry. Words can't even express the emotions I feel for how sorry I am for you right now because this is my absolute worst nightmare.
My dad is my best friend. He is elderly and on many medications for his health problems. He is literally my support system. I am in an almost constant perpetual state of red alert just for the day when I find him. I will probably go into hysterics, honestly.
I just hope they don't haul me off to an institution when it actually happens, I really hope I can somehow hold it together that day and every day after. No idea how I'll do it.
I'm sorry to make this about me, but I want you to know you aren't alone and I'm so sorry for your loss.
You will never forget your mother or the gifts she imparted to you throughout her life and yours.
Death is as natural as birth, and we all must face it one day or another. Just knowing she never has to feel pain again, never has to feel stresses of life and daily anxiety or any negativity anymore. Try to cling to the good in life and appreciate all the positives in every way you can.
I can tell how important she is to you. I realize now that the best gift I will have after my dad passes away, is always having his memory and his personality right there in my mind. So that whenever I miss him, need his advice, etc...I can always just imagine him and what he would say in a situation and the advice he would give me and its way accurate, even now I'm imagining it and he's in the next room sleeping so this technique can be used at any time for you as well.
I hope this helps you.