The 43-year-old musician and presenter opens up on her grief in new documentary entitled Myleene Klass: Miscarriage & Me for W, and hopes to break down the stigma around talking about pregnancy loss.
Klass said: “It is one word, but it is grief, it is trauma, it is sadness, it is fear. There must be a reason people can't say it.
“I lost a lot of me. I couldn't talk about it for a year, I couldn't even say the word.”
The singer is mother to daughters Ava, 14, and 10-year-old Hero with first husband Graham Quinn and has a two-year-old son Apollo with her current partner Simon Motson.
But she suffered four miscarriages before Apollo was conceived and likened the PTSD she suffered to a soldier returning from war.
She said: "I have got my baby now but, God, I lost a lot of me. I think it nearly broke me.
“When you’ve been through miscarriage, you’ve been through a battle with your body. You’ve been to war and there are casualties.”
She said of her relationship with Motson: “I didn’t want to talk about it as I felt like I’d failed. I used to think he must be looking at me like, ‘Why can’t she just do this?’”
Earlier this year Klass - who has a regular Saturday Drivetime show on Smooth Radio - revealed she suffered a miscarriage while hosting the live radio show.
She said: “I was on air. I went to the loo while the music was playing and there was blood everywhere. I didn’t know what to do. I had one hour left of my show.”
Klass turned to friend and fellow radio presenter Lauren Laverne for the final hour of her show.
She said: “I rang Lauren Laverne and she said: ‘Do one link, take a breath, come out and call me.’ She got me through. I did the next link and called her. We counted the links.
“I would go out, sob and come back in, take a deep breath and speak. I don’t know what else I would have done. I was on air.”
Klass - a classically trained pianist - rose to fame in 2001 after being picked as one of the winners of TV talent show Popstars and becoming a member of pop group Hear'Say.
She has gone on to appear in reality shows I'm A Celebrity... Get Me Out Of Here! in 2006 and earlier this year was the first contestant to be eliminated from Dancing On Ice.
Watch: Myleene Klass reports driver to police after she is spat at