Get the medical things fixed, the hypothyroid and the Perimenopause.
YOU HAVE NO IDEA HOW THAT HITS. At 45 I was moderately horney daily. At 50 I was scaring myself by my needs and desires. I dont think a guy can even appreciate how the female system changes.
I trust you are of similar age. Have you noticed any age related issues? Can you "rise to the occaision" with ease as you did before? Or is your need to be desired by her a crisis within yourself?
Pity me that the heart is slow to learn
What the swift mind beholds at every turn.
Edna St. Vincent Millay