Answer: Let's start with controlling crabgrass. It is an annual weed and will die out at the end of the summer but it will leave seeds which will be ready to germinate next spring. So, to stop this process you'll want to apply a crabgrass preventing pre emergent to your lawn next winter. It keeps crabgrass seeds and other grassy weeds from germinating. Crabgrass Preventer with Dimension? keeps on killing crabgrass up to 4 weeks after it sprouts. Dimension? also prevents the sprouting of many broadleaf weeds, such as spurge, chickweed, and henbit.
The dead places in your lawn can be raked out. I suspect the product killed the roots of your bermuda along with the tops. After raking you can either wait for the turf to spread into the bare areas, or you can take plugs from your healthy lawn to plant in the bare areas, or you can overseed the bare areas with fresh bermuda seed.
Good luck with your lawn!
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