hyperthyroid

Hi,
my test results say i have hyper thyroid.
I just delivered a baby, and the doctor said hyper thyroid comes sometimes affter delivery, and then after few weeks, hypo thyroid and then it will go away if i take proper medication

now my questions to persons vinng hte same situation are
1)will it go away after few months as the doc said? if not how long will it stay
2)iam breastfeeding, will it affect the milk?
3)what are the concequences of hyper and hypo thyroid?
4)wht should be done to make it go away?
5)will it cause hair fall?