Feeling weak, legs cannot stand long shaky feeling. cold hands and feet, it feels shaky. get dizzy, lightheaded.what is this?

Need an examination : It could be any number of things and the list is huge but some of the more common things that could cause this picture if it were to be occurring suddenly might be low blood pressure, low blood sugar, infection, or anxiety. If this just recently came on and is not getting better despite conservative efforts you should see a doctor.