with ocd you can obsesse about anything?

OCD is a anxiety disorder, like perhaps you're reading into this a bit too much. People obsess over heaps of things, unless it is something you are doing, getting so far that people notice, I doubt it's anything you should be worried about.

probably yes, OCD is an anxiety disorder

to relax and cam yourself, breathing is important. avoid rapid shallow panting and do breathe deep and slow, also called diaphram breathing, this is calming and is good for you

have a stretch often. pleasant daydreams will distract and relax you

any type of exercise also helps, especially long walks