Hi there, I really wish I could clear this up a little more for you but I thought I would just tell you my experience and maybe this will ease your thoughts a bit. I had a miscarriage on 6/8/07 at about 4 1/2 weeks... it was traumatic for me so I know how you must feel; I'm so sorry for your loss. I just got my "period", it lasted about two days, on Friday so it came about right on time for me. Some people get their period right on time after a miscarriage and for some it may take a few months to become regulated again, it all depends on how far along you were and how long it took your hcg levels to return to 0-5. I did a little research on cervicitis for you and your symptoms just don't match up, to me anyway. Cervicitis is usually caused by STD's that cause inflammation of the cervix and this just isn't you case! Check these websites out, they may help you.
Cervicitis: Causes and Cures
Cervicitis - MayoClinic.com
If I were you, I would get a second opnion from another docter; it sounds like you have not had a pleasant experience with your current one! Good luck to you and I really hope someone else can clear this up for you a little more! Keep your chin up :)