Today morning, while I was in the toilet, I had a sudden loose motion... For the past one week, I had not eaten or excreted much.. During the phase (of loose motion), my body became weak, I started sweating and needed assistance to keep myself upright.. it lasted for a couple of minutes and then drank a glass of water.. it slowly decreased.. I am not sure why it happened.. I m worried.. Is it anything serious? Please help.. Thank you