John Michael Montgomery in Rehab

John Michael Montgomery in Rehab
John Michael Montgomery
Laura Farr/AdMedia

05/13/2008 AT 09:40 AM EDT

Country singer John Michael Montgomery has checked himself into rehab for substance abuse, according to his Web site.

The "I Swear" singer, who had a string of No. 1 hits in the '90s, says his abuse troubles are due to "severe anxiety attacks and sleep disorder."

Of his rehab decision, Montgomery wrote: "I will be disappearing for a while to try and defeat the demons that have stripped me of my energy of life and good health for so many years now ... However long it may take, I'm gonna fight to the end and come out stronger."

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