Why is it that I felt like that on ecstacy?

Ok well last week on a friday I did ecstacy and ive done it b4 so I wasent new at it and I felt alright and the next day I did it again but when it hit me I felt really really weak and lazy and I got really pale and I felt I was gonna faint n but then I try hard to relax n focus n I drank some water n I felt alright but y did I felt like that waz I gonna overdoze n should I stop doing it for my health?