I will get some tomatoes thrown at me for this but here goes:
In order for you to be there for your parents, you have to be strong also. If staying with them means more financial struggle for them or you for an indefinite period of time…then dont stay.
Go, work hard for a couple of years, build a good base for yourself and then you’ll be in a great position to help them for the rest of their lives. I know it will be hard for them and it will tear you apart to not be there all the time…but what else can you do? Stay in Pak and try to struggle?