Dear cambell, this is much what the alcoholic describes once their drug-of-choice is removed. You are grieving the l oss of something that felt significant.
As you get back on your feet, this will get better.
It is so important to work on yourself because if one has co-dependent tendencies, they will find relationships with the same type of person into the future. Even if the person "looks" different in the beginning!!!
Now is a great window of time to learn about yourself.
dandylion