It's very personal, because 喺香港搵唔到錢 is different mean for different person. Some people have $50000 per month but still said 搵唔到錢, but some will said enough even $ 10000 per month.
Pls fully consider your family status and get a balance is suitable way.
I can feel that it is sad to see him go so far away but nothing can change it now, you must not hate your 99 and 姑仔, because they may be able to support you when your 老公 is not in HK... think about it!
Besides, if he works hard and make money, he may be able to help the family... think positive la.