Need help from parents who have done the cry it out method—

I have been doing this for a week at bedtime. First night, obviously the worst. Since then, it’s been either 1 minute or 10 minutes of crying, just depends on how tired he is. But now during the day, he has been SUPER clingy towards me. Needs to be held during naps, and sometimes he will just scream and cry (after just waking up, eating an hour ago, diaper changed, burped).

Is this due to the CIO? I know it probably has a huge affect on it, but it was time to do it. He is 8 months old and was still waking in the night and then wouldn’t go back to bed, i couldn’t take it anymore!