More information is needed, but usually with a serious injury such as yours, if you can prove negligence and causation, then there is a possibility for recovery. Contact a personal injury attorney for consultation.
If for some reason (new charges, failure to appear, or arrest warrant issued) the bond is revoked, the court will order bond estreature, after which the bondsman will produce the defendant, file a motion to vacate the bond estreature and discharge the bond. I can't think of any other reason why a bond would be discharged while the case is pending. Consult with a competent criminal defense attorney.
If your attorney "dropped" you demand a release letter so that the next attorney will not have to pay for the prior attorney's time, otherwise, it will be difficult to find another attorney willing to take on such an iffy case as this