United Kingdom, March 29 -- Natasha Hamilton felt "insecure and embarrassed" after going through early perimenopause and being diagnosed with a thyroid-attacking autoimmune condition.

The 43-year-old singer left Atomic Kitten in 2004, and later that year, she went on to welcome her son, Harry, 21, into the world on New Year's Eve.

But following his birth, Natasha battled postnatal depression.

She said, "It wasn't the way I ever saw my career going. For it to end as bad as it did, it was so sad. And it just left such a horrible feeling in my body that I couldn't really talk about it."

Natasha is also mom to Josh, 23, Alfie, 15, and Ella, 11, from previous relationships, and she has a two-year-old daughter named Kitty with her husband, ...