I'm feeling really obsessed about something.
Oh no! Why are you feeling obsessed?
I don't know how to deal with this situation and I'm worried about it.
It can be frustrating to not know what to do. Maybe you can talk through your options with someone so you can get clarity on your situation.
I'm going to tell my doctor so he can give me a solution.
That's a good idea. If the doctor doesn't have any solutions they might be able to refer you to a therapist.