I do the the add back therapy too. Can I ask you a question? Has it caused you to gain any weight? I went from starting it at 107 lbs to almost on my third month or third shot soon, and I am 117 lbs. I am tiny as it is so that is big for me.
They use Lupron in some of the IVF treatments, so I don't see why that would affect your long-term fertility.
As for the mood swings - ask your doctor about a low dosage anti-depressant. I'm not wellbutrin and haven't experienced any mood swings (though I'm only on day 10). I still get the headaches, though.