Hi there,
I have had PMDD since I started getting my period at the age of 17. I did not necessarily treat it, even though a dx had been given to me. Aside from the fact that my psych history is long and arduous, PMDD was being treated by proxy. In oher words, all the meds I was on for other things, threw it in to obscurity of sorts.
At 31 I went in to perimenopause but it took 4 years for them to work it out. I am now on HRT (Hormone replacement therapy) but I still get the occasional period and now understand just how horrendous all the PMDD business is as I am not on other medication any more. I also have endometriosis, cysts and fibroids.
Mostly, all I can say is that I really feel for you and wish to give a

. It is awful beyond what words can describe. Some basics.......
-Drink at least 2 litres of water a day.
-Avoid chocolate, caffeine and processed foods at least a week before you get your period.
-Increase magnesium, vitamin B intake and get Vitamin D checked. Also have thyroid checked and sex hormones checked.
-A pelvic ultrasound is also a good idea, just to rule out any physicality's.
-Exercise is excellent, if you can do it before you get symptoms.
-And I find Rescue Remedy(spray) is good for heart palpitations and general nervousness (Mg will also help with that). Short of that, some "as needed" benzodiazepines will help.
You mentioned that you worked in medical (I also used to work in a hospital in pathology. I can totally understand the stress of the job) so my apologies if I am telling you things you already know. If you ever wish to talk, feel free to PM me.
Take care of your precious self. It does get easier when the right things are implemented and your treatment is duly issued.
Michah