What Causes Headache, Nausea, Leg Pain And Lightheadedness?

hi i have been having headaches for past fewdays, symtoms of the headache and it feels as if there is something pushing my head, pressure and i have gotten lightheaded and due to this i felt very nauseated and felt like vomitting, when i get up from laying down the symtoms are worse, and only left side of my body gets puffy in the middle of the night and my legs hurts every night with a sharp pain.