Maybe because you treated your anxiety, your depression can now come up? Maybe because of the work that you have done you can now look at everything and you are sad because now you can see it? If so, this is all normal and it is progress. Denial keeps the sadness at bay but it doesn't allow us to heal. Actually accepting our situation and really seeing it is the first step in healing. The sadness is like a grief that needs to occur. Keep working and it will get better too. Continue to keep us posted on how you are doing?