Seat fabric problem

My driver's seat is already beginning to fold over on itself. That is to say it has creases in it because I am a rather large guy and I have sat in it and I believe that is what has caused it. The middle of the seat is already beginning to stretch apart but not close to ripping I do not think. I know that at some point I would have to take it to someone who works on seat fabric and have it fixed, but I have no clue of what expense that would be and I am not in the situation to lay out a lot of money right now. This weekend I will likely drive the car a total of seven hundred miles give or take. Maybe ten to twelve hours in the car. I wanted to know if these seat fabric problems get much worse quickly because I do not want to return from this weekend with my seat ripped and to need to get it fixed by Monday? Any opinions?