side effects-questions

I had a couple of questions regarding side effects. I have had my mirena for 3 1/2 years. I only recently realized that some of what I am feeling may be caused by it, such as headaches, nausea, lightheaded, tired, depressed, mood swings, and especially irritation/itching which is what caused me to start researching the side effects. I also have not had a period for over 2 years, I just saw an ob/gyn and they did not seem to think anytyhing of not having a period for 2 plus years.
She did tell me that Mirena does cause the bad bacteria to be more prevelant in the uterus which causes the itching/irritation.
My questions are: Do any of your side effects come and go? There are days, like last week, where I barely had enough energy to stand, then the next day I am fine. The itchiness comes and goes about every 1 1/2 weeks and lasts 1 1/2 weeks to 2 weeks. I can go a couple of days with no headache, then the next it feels like a migraine where I am nauseous. On days I feel fine I am wondering if it is the Mirena or if I am just getting older (I am 38.)
My second question, have any of you experienced the itchiness/irritation (mabye bacterial vaginosis?) did your dr. advise you to take anything? Mine said to take something called probiotics. It is supposed to level out the bacteria in the uterus.
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