I have the habit of pulling my hair since 15 years, the bald patch gets better and than back

currently under the stress of my exam I'm pulling my hair out like crazy and the bald patch is getting bigger again.

I sometimes eat the hair too.

And I'm pregnant. I'm scared for my baby but I can't stop too. I just zone out when I'm doing it.

I have seek help. But the trichotillomania keeps coming back when I'm extremely stressed.

If anyone else has it, how to keep pull free under stress?