I have been experiencing headaches that are throbbing primarily in the back/top of my head?

My name is (…) im 25, I have been experiencing headaches that are throbbing primarily in the back/top of my head sometimes it will travel to my forehead and eyes, I been having dizzy spells, being forgetful and sometimes it’ll stop me in me right in my track, joint paines in my wrists knees ankles and underside of feet usually follows by a shock like pain traveling though out the areas. I have troubling sleeping most nights and sometimes I get these cold chills. This has been going for a few months and doesn’t seem to get better. Could someone tell me what they think it could be?