Migraine and depression

As I get older I am finding myself more prone to periods of depression and as hard as it is to deal with migraine, I am having a harder time dealing with the depression. I used to bounce back quicker and now I notice that my migraine "hangover" drags on and on. I also have a history of anxiety which I am sure anyone with migraine can understand. I am not sure if the migraine is what is causing the depression, or vice-versa, but since migraine, depression, and anxiety are inter-related, I was wondering if anyone else experiences this and how you cope?