It is your duty to get out of this business if you can and stand on your own feet without having to continue in this situation. Until you are able to do so, you may ask forgiveness of Allah and pray to Him to help you get out of this predicament. Allah is with those who strive to lead a righteous life: The Prophet (peace be upon him) said, "whoever clings to istighfaar Allah will appoint for him or her a way of exit out of all distressful situations and provide for them in ways they would not estimate in ordinary times."

So, never despair of your situation; you are not stuck in this situation; you can get out if you try hard enough.

Having said this, let me also remind you; The fact that you are forced to be in this business does not in any way render your fasts or prayers invalid. For in Islam the fact a person commits a sin does not mean that his prayers are invalidated, although ideally one should stay away from sins, to conform to the true spirit of prayer.