They are related--I think they may both be classified under anxiety disorders in DSM. But I specifically have been diagnosed (in the past) with OCD, Generalized Anxiety Disorder, and Panic Disorder. And the various symptoms fit. The latter one less so in the past couple years. Definitely the first two. Though I suppose all the worry could possibly be classified as obsessions? But I have a couple compulsions (like hand-washing and some counting stuff--had a few other ones as a kid, too), so the OCD is definitely an element.