I'd give them baths and make SURE they are completely dry so they don't get chilled, get some Rescue Remedy or something to help them deal with the trauma and stress. Poor babies, poor you -- so sorry for your losses. I had a heat lamp fall and break one time although it was (IMO) securely fastened. I know others say chickens don't need heat, but because it makes ME feel better, when it gets into the low teens or single digits I turn on a portable heater with auto shut-off and overheat protection. I set it on top of the metal feed can and position it where it is out of the traffic flow. I make sure there's no combustible material with a couple of feet of it.
ETA: When I say give them baths, I do mean a regular bath with warm (NOT hot, NOT cold) water. You can use pet shampoo, and if you use the kind for fleas and ticks, it will also kill mites if the chickens happen to have them. Make sure to rinse the chickens well, and blot with a towel to remove as much water as possible. You can then blow dry them or leave them in a warm room (bathroom, utility room, etc.) with no cold drafts until they are COMPLETELY dry.