Amy Winehouse is on the verge of a breakdown following her husband's arrest.

The "Rehab" singer, who was left devastated after police charged husband Blake Fielder-Civil with perverting the course of justice last Thursday, has worried friends with her erratic behavior since Blake was imprisoned.

A source revealed, "We are all so worried. This could push Amy over the edge. She is already so frail. She is totally lost without Blake, she is constantly crying and screaming."

Blake was moved to the medical unit of Pentonville Prison at the weekendafter doctors feared he could self-harm because he was missing Amy so much.

A source said, "Yes, he is crying non-stop, but he is crying for Amy. He'smore concerned about her than for his own safety, he misses her terribly."

Amy's father Mitch is hoping Blake will be jailed so his daughter can seekhelp for her own drink and drug problems without her spouse's influence.

Mitch said, "If Blake were to go to jail it would be the best thing that could happen to Amy. We could get her into rehab."

The 24-year-old singer was hospitalized in August following a drugs overdose.

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