I've been under a lot of stress recently. now most of the time i feel cold, especially after eating and i even start shaking. why? and how to stop it?

Well ...: When you eat a meal, blood is redistributed to the abdomen to aid in digestion ... This is probably why you're feeling cold (particularly in the extremities). That said, you mentioned you were very stressed recently - are you eating to combat stress and anxiety? As this generally doesn't help (and may actually make things worse). Perhaps talk to a psychologist to help?