After 2 month break go to runing 1km but after jog feling like dizzy, nausea and near faint feling normal after 5 min lay on flat surface.wth was that?

Drop in bp: You started to get a little sick probably from a combo of problems, out of shape, low blood sugar, etc. This can cause a reflex in some people where the BP drops. This is what causes people to faint. You did the right thing by laying down. That restores the BP and reverses the reflex. Medical jargon for this is "vaso- vagal syncope" if it happens often see your doctor. Eat breakfast and lots h2o.