Hello I dont understand I bought for 4000 Eur one hour ago of Ethereum when it was going up, it stayed around the 10-20%, it started to decrease 5 minutes ago so I sold it and now cex.io just gave me 3500eur for it... wtf... 
The %came from me watching livecoinwatch.. Cex.io doesnt have the accurate price ??
Yeah you panicked and you lacked lots of knowledge about the basics. Huge investment comes with huge fees and before and after you trade plus you have lost an amount in the process. All sites that provides trading already calculated it even before and after you trade . You are the one to blame because you lack the knowledge.The %came from me watching livecoinwatch.. Cex.io doesnt have the accurate price ??