How is the colour now, could you live with it? If so, leave it !just keep washing in medicated shampoo or any nice cheap shamppo that will help to strip the colour. Do NOT put any more colours on it yourself. Your hair will end up in such bad condition that you won't even be able to get a comb through it.
You could go to a hairdressers, one with a good colour technician, to try and sort it out. Red does fade fairly quickly so thats good news. Make sure you use plenty of a good conditioner just to get it in order. If the condition is bad now, i really wouldnt advise you to colour again, not yet aty least. Good luck! the perils of home colouring, ive seen it so many times, i work in a salon.