If you dyed your hair five times in one day you may have to be careful but unless you bleached it, coloring in again the next day shouldn't be a problem. Don't do boxed dye. It has a higher amount of ammonia in it and causes more damage. Go to a beauty supply store and get the color. If you are going darker or the same color level, use a 10 volume developer. Don't go higher than 20 as again this will cause more damage. Good luck :-) Feel free to ask questions if you are uncertain of what I am saying
The chances are that your hair won't fall out, but you're likely going to have to strip it too to get the colour back to normal. Dyeing, stripping and then re-dyeing your hair is going to put it under a lot of stress in such a short amount of time, so it will likely be damaged. I recommend getting something like macadamia and argon oil to help heal your hair afterwards.
It depends on if you bleached it. If you didn't.. Then id say go ahead just make sure you condition it after with treatment, but if you bleached it and you dye it again you're going to damage your hair big time
It depends. What's your natural hair color and what's the color you attempted to dye it?