Sunshine, I may not be of too much help to you. I am only JUST now getting information on the Oxy powder stuff....but on a quick note,
we were INFESTED with worms form a puppy we brought home from the pound. I had no idea about liver cleanses/flushes, colon cleansers etc. and we did Humaworm on good faith. Humaworm can be a stand alone cleanse/all encompassing. The first cleanse, it cleaned out A LOT, kidneys, liver, guts etc. (we are now on our third cleanse because we were so infested, so far so good! :D and we have all felt even better after every cleanse)
I think that because you know your body more then anyone else that you have a better guess on if you need to do something. I know that this does not give you much guidance, so I hope that someone jumps in here, but I know the Humaworm forum can be quite slow....
As far as you missing your period, it could be a great many things! Hormonal imbalance, PCOS, Adrenal fatigue, etc. etc. And yes, parasites can help aid in the cause of lots of these things, so getting a parasite cleanse is a good step! I would also consider food allergies once you are finished. This is something I did and it helped TREMENDOUSLY heel my body!
We did Humaworm, then DE after to help clean the colon (there are things in the humaworm cleanse that help get the bowels going...we have a good two to three poops a day, and if you feel you are not moving well enough you can always do some sort of enema..)....I still have yet the courage to do a Liver Flush....there is not many people out there who are willing to give you a step by step on what you are going to feel etc. If you are brave enough to do that, fill me in hey!? But from what I have read on helping people heel I would consider doing it if I was brave like you are!! :D
P.S. It is NEVER too late to take back our health!!!