I had a lot of moss on my lawns, so in May of last year i used a moss killer that seem to work, however before i could rake and re seed the lawn we had the drought. after the drought i did what i could to clear the patches and put some grass seed down, some has taken but i cannot believe the amount of very large weeds that are now all over the lawns, the weeds seem to be growing and i wounder if using a weed and feed solution would cause further damage at this time of the year... i am a lady of an age so i am not able to do a lot of heavy physical work many thanks for any advise you can give me Kathy
Manual weed control, pulling, digging is the best but requires physical work.
Chemical weed control with the "weed and feed" type of product you mention is possible. That will kill broadleaf weeds and not grasses, if you follow the label instructions and precautions.
If you have trees in the area be advised that some broadleaf weed killer chemicals can harm trees if the chemcials are taken up by absorbing roots in the area that is treated.