It sounds like your relationship was a huge part of your life, and I'm sorry you have to endure that loss.

Now is time to discover yourself though, who you are and what you want out of life. You may want to see a therapist to help you through this process of getting to know yourself, or you could take the self-help route and read some helpful books. Perhaps you could write a list of activities you'd like to try and try them at your own pace.

One thing I would definitely recommend is exercise. It is healthy for body and mind, and anyone can benefit from it.