Sarah’s laughter depicts the possible of everything that is impossible with you but very possible with God. It is possible like Sarah, you are saying can I still have pleasure, how will offset this medical bills, rents, how can unworthy servant like me find grace before God and all such.
Here is good news for you, the same God of Abraham, of Isaac and Jacob is still our God today. Fear not, He will do it, all you need do is keep trusting, keep believing, and keep holding on, never relent.

further reading http://overcomers-faith.org/