aw! sweet of you to look after this kitten. if you can get a cat carrier and fill it with a blanket and some catnip toys then place it in the area the kitten is in. see if the kitten finds refuge there and becomes comfortable. give it a few days of just going in with the kitten and just sitting and reading or listening to music. when you come in bring in something like a treat or food. so you will be associated with nice good things. eventually you will need to get the kitten to the vets but this will most likely take time. with the flea spray if you are using Frontline spray you can spray it on a brush and comb the kitten instead of spraying directly. just make sure you brush back towards the head and then back down towards the tail so it reaches the skin. the best thing to remember is patience. All the best and i'm sure many people will be along to give you other ideas as well.