I understand - I don't know if I've any amazing solution to finding joy again other than trying to be positive. Be very aware of your self talk and question it if your feeling sad because more often than not the labels we give things are so heavily laden with our memories that we really don't stand a chance unless we change or stop our thoughts.
Happiness is an inside job. I know I used to and if I'm honest I still do a lot as I'm only finding my way too - I used to look to people or things to make me happy - and someone said it's not their purpose to make you happy. It's a slippery slope if your happiness is hinged on someone else or some thing. My happy right now is in appreciation of the beauty all around me.
I can only just say what's helping me. Be kind to yourself - give yourself time to heal - expect to have ups and downs - it's natural. In time you will get to your 'happy' but you need to open up to it.