I'm very much reassurance seeking with my therapist. I also have OCD, and I was recently reading about "reassurance OCD," so I'm wondering if that's part of it? I also seek reassurance from my husband, who isn't the best at giving it--he just tends to get annoyed with me. My therapist can seem annoyed at times, too. So you're not alone.
I would tell your therapist what you said here. Maybe even print out what you said and hand it to him (or email, if you meet virtually).