Tell me again why you are now living with your daughter? Your house was too big? Too many memories about your recently lost husband? Okay. I understand that, many of us have gone through the same thing.
I am with others here. Move back to your house. Close off parts that you don't use. Get it ready to sell. Use Uber to get around. As for the sadness, I will share with you this.
I cried so much after my husband died. After some months, I just couldn't stand it any longer so I went to a counselor. She asked me, "What is your goal in coming here." I replied, "I want to stop crying." She placed two chairs facing each other and had me sit in one, pretending my husband was in the chair opposite. Talk to him, she said. Feeling very silly, I did. I told him how much I missed him, how I didn't know how I was going to live without him.
I don't remember everything I said but then she had me switch chairs and pretend to be him. "Answer her," she said. So, I sat there for a few minutes and thought, "What would he say to me in response to what I just said?" And I knew. It was that he loved me. That he wanted me to be happy, to have a good life even though he wasn't with me. He would not want me to be so sad.
A week later, I walked into the counselor's office and said, "I'm fine. Thank you!" And walked out. Now and then I still miss him. But it changed my life thereafter. I hope you, and everybody else here, can find their way, too.