Stress causes muscle tension and yes, pain. I get angry at ignorant doctors with the "all in your head" garbage! :angry:
Now, about your PMDD I would definitely get some meds to balance that...or at least try herbals such as EPO (evening primrose oil) Blue Cohosh, Black Cohosh etc... natural plant estrogens that don't have the side effects the synthetics have. I had a neighbor who had those PMS outbursts and she nearly killed her husband before being DX'd (unfortunately, he left her anyway even though meds controlled it.

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I have my own thoughts about morning ppl... from what I can guess, the ppl who have morning problems waking...have blood sugar imbalances. Just my POV... but if you can eat an apple in the morning and begin to function, then I'd say that was you too... but diabetes and hypoglycemia both can cause a misfunction in the mornings for some reason (the "fasting" part of the night.)
Those are my current thinkings