A bridge in a dream usually marks a transition -- the point where you're moving from one state of life into another and need something to carry you across. Crossing it easily can reflect readiness for that change, while a bridge that sways or won't hold your weight often names hesitation about the decision itself.
The Part of Fortune with ill planets in the fourth, ninth, or tenth houses, denote death to the sick. - William Lilly (1602.-1681.)