re: My lawn from hell. How do I fix this?

I'm totally against weed and feed products. Kill the weeds first then feed your desirable grass. When my bermuda is 50 percent green in the spring I apply first round of a high nitrogen fertilizer. Make sure it gets a minimum of 1 inch of water a week, then fertilize again 6-8 weeks later. Make sure you water regularly in heat of the summer, a stressed lawn is more apt to develop weeds. Fall pre emergent of Barricade in mid October to prevent winter weeds the spring pre emergent of Demension in mid February to prevent crabgrass and other summer weeds.