The 23-year-old "Pillowtalk" singer, who recently pulled out of a gig in Dubai because of his problem, has been relying on his girlfriend for support as her positive attitude helps him to relax and she can ease his fears better than anyone, reported Female First.
"Gigi has a very calming affect on Zayn and will spend hours on the phone with him when he is having a bad day. She will remind him to take deep breaths and to do those things that relax him like drawing or painting.
The 21-year-old model also sends motivational messages to the pop star as another means of support.
"Gigi has been doing everything she can to help Zayn overcome his anxiety and panic attacks. She is constantly giving him reassurance that he is safe and nothing bad is going to happen to him.
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"When she's away from Zayn, she texts him inspirational quotes from Deepak Chopra and Wayne Dyer," the insider said.
Malik recently announced that his "extreme anxiety" has forced him to pull out of a show in Dubai next month.
In June, he was due to perform his first UK gig since leaving One Direction at the Capital FM Summertime Ball in London but pulled out at the last minute.