Lucky,
i too married at 29 after living together for almost 12 months but when that marriage cert. Was signed a bizarre new me emerged, I was so uptight & tense & worried etc etc, with the help of a friend who also happened to be a psychologist I came to see that for some reason I had changed with becomin a "wife".
I know that these days we're supposed to be equal & share etc, but there is still constant input, media, books, movies, people's comments etc etc & that goes into our subconscious & for me it "came out" as stress that I was not being the "good little wife & doing all the housework etc etc" even though I was working while he was at home finishing a college degree.
So if (as seems the case by what you say) you weren't like this before marriage & if (as I assume) you haven't had any accidents to cause the pain etc, see a friend &/or counsellor you can trust & think about whether this pain is the way your subconscious is choosing to let out your fears of failure, of not being "the perfect wife" (something women get thrown at them from all sides but men can do whatever - take marge simpson versus homer!!!!) fear of marriage failing (especially if your parents are divorced or having problems) fears about coping financially or with children or of things you feel the two of you haven't fully discussed & sorted through yet. Another one is, we obviously want to get on well with our in laws, but that isn't always possible & maybe you feel guilty about that or the opposite, that he doesn't get on with your family.
We think the hard part is meeting the right person & getting through the ceremony, but in truth the hard part is learning to live with each other as "a married couple" & as I say, this applied to me even though we'd been living together for 12 months prior to marrying & in the same house we lived in after marriage, yet for some reason after it became legal I started stressing out something fierce & for no "valid" reason.
Before you get hooked on meds of any sort of cbt see if any of the above or similar maight be the actual problem, work through it & you'll be fine.
A couple of other things just occurred to me; did you get a new bed &/or pillow - maybe it/they are too hard/soft ?? You mention clenching your jaw, could it be dislocated? In other words alot has changed one way & another & there may be a simple answer.
Good luck. Pm me if you want to chat.