Yes, yes, yes to all those symptoms.
I have 24/7 face tightness, 24/7 eye pressure (both eyes), 24/7 ear fullness (both ears), 24/7 neck tightness, 24/7 whole head tightness.
I tried wearing the mouth guard ( $500 out of pocket), and it made my head pressure worse in the morning.
I tried the cheapy "football" mouthguards. No luck there either.
In 2004, I started taking Effexor XR before bed ( for depression-anxiety and for muscle relaxation-clenching)
This is the only thing I've found to work for me. All of the tightness everywhere is still there 24/7 , just not to the point of not wanting to get out of bed and face the day.