Hyperthyroidism and breastfeeding

I've been breastfeeding my son for almost 4 and a half months. I seen my specialist yesterday and my thyroid levels are increasing. He prescribed Methimazole (10mg) a day. He told me to ween my baby because this medication could cause thyroid problems for him. So I've already bought formula, bottles etc... My question is how long can I still nurse before being DONE done? The most important question I forgot to ask cause when he said I had to ween him I started crying and couldn't talk. I felt crushed. I did call his office today and waiting for a reply but has anyone had this problem?

[mum2beagain]

Well if I were you I'd be done before you start the meds. You can gradually wean dropping one feed and replacing with formula every couple of days until all baby's feeds are formula. If you need to start the meds sooner then I would stop nursing your baby all together. Wear a tight bra and if it gets painful hand express just a little to relieve the discomfort.
You have done a great job giving your baby the best start in life with breastmilk but your health is important. The best thing a baby can have is a healthy happy mommy. Formula is perfectly adequate nutrition and your baby will be just fine once the switch is made.

[babyinJuly]

Thank you, you're right! He is gaging with the formula but I'm going to continue trying until he takes it. I'm not taking the meds until he takes the formula.