What Do Headaches Along With Nausea And Dizziness Indicate?

Hi I have had a headache for over 3 wks now. On my left side. In the front/side. Throbbing pain. It affects my memory, concentration, thinking ability. Light nd nose makes it worse. mild to moderate pain but lately it has been worse now moderate to severe. I can t get out of bed. Feel really tired. I also feel really nausea nd nd I get tremors in my hands when I am trying to do activities. Also when I am resting nd lying down it feels like my body is shaking. I have a stiff neck. I have no fever . I have been to the doctor and they gave me some pills for Mirgranes but they don t help with the pain. After I have had a sleep I feel worse. I also feel dizzy or light headed when standing nd walking .