Legal action against the husband for abandoning wife and child

I am a resident of Dubai. I want to ask about my husband who brought me from Dubai along with my 3-year-old son by fraud to spend a vacation in Pakistan in Dec 2019.

He forcefully took over child passport and other documents of UAE visa and left us alone in Pakistan and runaway back to UAE.

I am on an employment visa and my son is under his father's visa. I need to come back, but my husband is keeping the passport in Dubai with him and he is not ready to give it back to me.

I am stuck in Pakistan as I need to bring my son to UAE. Now he threatens that he misplaced all my personal belongings; my gold, jewellery and important documents in my absence from home in Dubai.

He wants to divorce me in Pakistan; that's why he is forcing me to stay in Pakistan so I cannot file a maintenance and child care claim in Dubai.

If I come back to Dubai, can I get help to get my son's passport from him in order to bring him to the UAE because the child can't live without his mother?