Hypothyroidism...safe to Have Breast Reduction?

I went in for my pre-op on May 7th, scheduled to have surgery on May 17th. At my pre-op the PS found a nodule on my thyroid and seemed rather concerned. He sent me to get bloodwork done and also scheduled me for an ultrasound on my thyroid. I just got the results from my blood test on the 11th and it said I had hypothyroidism. Since finding this out I have been petrified of having this surgery. I have 3 kids, I don't want them to have to go through losing a parent and have to grow up without me.