Why Am I Still Cold With Numb Fingertips Post Thyroidectomy While On Levothyroxine?

I have NO thyroid. It was removed 12+ years ago. I am female, 72, with controlled HBP currently taking Synthroid 100mcg since March of this year. Before Synthroid it was Levothyroxin from 150 mcg down to 125mcg, The results of a blood test in late March is as follows: T3, free level is 3.6; T4 free level is 1.9, and TSH 3rd generation is 0.01. My hands are always cold, as am I, and my finger tips are always numb! I just started seeing an endocrinologist in March and she changed me to Synthroid and added T3 on top.