GO to the doctor and have them examine how serious this injury of yours is. You may be saying your chest is "torn", but that may not be the proper medical explanation, nor is our perception of torn necessarily the same as the way you mean it.
I assume you mean it in the sense of an actual sprain. If so, a week means absolutely nothing in terms of healing. Even broken bones heal quicker than spraining muscles/tendons, and that requires at least a few weeks to a few months You need months minimum to expect a sprain recovery, and I don't mean 1 month. Two or more, sometimes up to 6 months (or even more) might be needed depending on the degree of the injury. The reason for this is that many tendons get very poor blood flow and thus lack the nutrition and oxygen which are both instrumental for healing. Know that sprains are different in that it will never fully repair back to 100%, and if you continue to injure it by working out, etc, before it repairs, will only cause far more issues down the line.
An example of how sprains never heal 100%, for those of you who sprained an ankle, even slightly, you may notice that you have been more viable to get it sprained again time and time again in the future.