It was the same with my night grinding, Katie.
- couldn't open my mouth fully, it felt tight (some may see that's an unexpected perk though
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- couldn't close my teeth together, it felt tight.
- worse upon waking. Eased off a bit as the day went on.
- could be worse when eating but not a major factor for me outside of the worst times with it.
- felt like I had some sort of toothache but it was more the gums.
- swollen jaw muscles noted by the dentist along with the grinding but nothing wrong on the x-ray which he had taken weeks before to update their records (I was a new patient).
- pain down the right side of my face, sometimes both sides.
- sometimes a bit of neck pain.
I looked at night guards but they are pricey and some say they don't help anyway. Later when I joined the walk-in groups I spoke about it and the co-ordinator had been through it with his anxiety. He bought a nightguard but found it too uncomfortable to sleep in. That was one of my concerns as insomnia was a major problem for me earlier on.
What he did in the end was sleep with his little finger in the corner of his mouth and it worked! Whether he's a permanent thumb sucker these days, I'm not sure
I found the exercises worked well for me. I did them when it felt stiff in the day sometimes. But it got to a point where it wasn't getting any better and I found having a couple of paracetamol before bed helped.
I've only had it back here & there in the years since but never for more than a few days at the worst times.
Good to hear the breathing stuff works. I agree, we start feeling better and drop our healthy behaviours
I've done that loads too.