Caring for my grandma with dementia is like an emotional roller coaster.

One of my dearest friends found this site yesterday and asked me to have a look. I was blown away at the amount of people out there going through exactly what I am going through.
My gran is 88 years old and living with me. She has dementia and sometimes its so great to see her smiling and a little compos mentis cos she and I can have good conversation, granted they're about passed experiences and she brought me up so its good memories. Other times its not so great. Like her taking off her clothes (which I've read here is a common thing) and removing her nappy (which was starting to get to me cos then there's a urine smell that feels overwhelming everywhere).
Now that winter is here and the mornings and evenings are cold, I worry about her catching flu when she takes off all her clothes and lies naked in her bed.
On Sunday night it was the worst cos she started at 2am and didn't finish till 7am. By that time I was a walking zombie. I kept going back to lie in bed and hope to heaven that she wouldn't freeze. Her last call for me was to tell me that she was freezing and that she was never coming back here again. She was going home tomorrow (but she's lived in this house for 30 years now) and she never wants to see me again. I was angry with her and at the same time very heart sore. Then this morning, it was like yesterday morning didn't exist, she hugged me and smiled and told me she loves me.
Not an easy thing for me to deal with at the moment.

I've been taking care of my gran for about 4 or 5 years now, since her stroke. Before then, she was always somehow taking care of me.