I have bleach blonde hair and I dyed it with sun-in. It is terribly dry and I have many split ends. I really want to dye it back to its natural colour which is dark brown. When my hair was natural it was really soft and shiny but now its just a mop of dry split hair. Please help me!

Oh blimey go careful dying it yourself it might go green sun-in is lethal stuff to be honest I would go see your hair dresser.
I remember buying a bottle of sun in when I was 15 I thought I looked great until my hair started breaking off in clumps. No fun at 15 having 9 inches of hair cut off but then it was awfull and boy did it need it.

I recommend that you go and have a good cut - the only way to get rid of spit ends is to have them cut off... There is not lotion or potion to repair them forever - the creams you buy will only smooth the hair down until you wash it again -
Sun-in is terrible - You need to put on a SEMI permanent colour - They are full of vegetable oils and are great to make the hair shiney - The semi's you can get today are great as they last anything up to 25 washes - and with the hair losing some of its porosity they will last a bit longer - let me no how you get on
Good luck