I certainly suffer with diarrhoea during stress times and when on any type of drug especially ABs. I have had two tooth abscesses in my life and each time they grumbled for some time before fully erupting. I think low grade infections must make one feel unwell generally. I know,as a dentist's daughter, these are not always easy to detect at their early stages. I believe the tooth can die and this may give some discomfort before settling down and then it can go months or years before flaring up into an infection. Sadly it is all part of ageing - our teeth decline along with everything else.
You sound as though you are suffering bad peri meno but try to pace yourself a little more, keep to a simple diet and give some time fro the Ads to fully work. If still not feeling good then go back to GP and discuss HRT with printouts of info from this site. When I feel sick I find fennel or peppermint tea rather good.
DGx