Hi Lisa, and welcome to the board.
Well done on the steps you've implemented, please keep it up.
About your questions ...
You asked:
"I read that pms/pmdd sufferers should avoid corn and canola oils (among aother things, of course) and that we can use olive oil. Can vegetable oil or soy-bean oil be used also?? I am also cutting on salt, and am very sad about this (I know, I know---Im a baby) How much should we cut??? (PS, I am getting kind of used to it...)."
If the corn/canola info. you read was here on this site, I need to clarify some things. The manufacturing process of corn and canola oils (big brands!) remove all the healthy properties of the oil, thus it is a poor choice if you want to improve your diet for your health (regardless of PMS/PMDD).
The best choice of oils are "cold pressed" (meaning the oils have not been super-heated and refined through many processes). Also, it is healthier to not cook any (even cold pressed) oil at a very high temperature, as this changes the structure of the oil and turns it into a health hazard, instead of a health boon.
So the upshot of all of this is that as long as the label says "cold pressed" (some canola brands are cold pressed and thus very healthy) you should be fine. I recommend reading labels. You can also use peanut oil (it is tasteless and a very healthy choice if you don't have any peanut allergies), and sunflower oil.
You can read more about cold-pressed oils and their health benefits here:
http://www.majidali.com/Vol%201%20No%202%20Oils.htm
About the salt issue, there is no need to cut salt out of your diet completely. We need salt in our bodies for good health, so the only recommendation I make is to cut down (we only need about 1 tsp of additional salt to a normal healthy diet daily).
Hope this answer your question.
All the best,
Anthea