Seperation anxiety

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My 12 month old has some serious separation anxiety issues. I can't take it any longer. I can't even walk 4 feet away from him without him screaming at the top of his lungs. It's not fair to my other kids to see me this stressed out and to hear him screaming 247. I don't know what to do anymore. He cries with his dad he cries at daycare. Anyone else in the same boat?