Tough situation. OCD hopefully isn't going to pose an immediate threat to anyone's health and safety... if that's the case you can take some time, do some self-study and try to learn about more it if you haven't already. If you think you understand your issue, then research treatment options. There might be cognitive therapy or lifestyle changes which can help.

I'm not sure, I know nothing about OCD other than what the acronym stands for. But if it's something that you can address on your own satisfactorily that will simplify your aviation medical certification. I assume that untreated clinical OCD would be a no-go with the FAA, but am not sure.

Also you need to find out what DSM-V condition actually correlates to "OCD"... that's what you'll need to research wrt to FAA certification.

With that said, all good pilots are probably a little bit "OCD"... helps us to live longer.