Deciding what to do about selling "the" house is one of the hardest decisions. When I sold the house after Jerry died, I thought it was the right thing. It was almost 2 years, about where you are in the time frame of all your losses. It just seemed to me that the kids (they were 9, 12, 15) were not moving forward. He died in the house and I felt we just couldn't get on with life because we were always thinking about his absence. I didn't know then that we would never "not" think about his absence!
At times I have missed the house and wished I hadn't sold it, and at other times I have been encouraged that I made the best decision that I could have made at that time. Sometimes I think we emotionalize the place because we are missing the person(s). Our memories are treasures and it is wonderful that we have them and can "take" them with us. However, we want to own the memories rather than the memories having control over us. It's a hard process. There are no absolutes, no right or wrong choices. Sometimes there are better choices and occasionally there are only the choices that have to be made.
Whatever you decide to do, I pray that you will find peace and strength through your faith. God will never leave you uncovered or unprotected. Where ever you go, you will take the love of your friends and family with you along with all those boxes of memories and treasures!