Do I have fibromyalgia, arthritis or Lupus?

My mom has all of these and her mother (my grandma) and uncle have lupus. My aunt and my cousin (from my dads side) Have fibromyalgia. They have been telling me I need to be checked for these things because I am always having pains somewhere in my body. I have pain in my stomach and chest, I hurt in random areas of my body. The pain comes sudden and it has pulsing peeks, sometimes it only last minutes sometimes it last days. When I use my hands, mainly my thumbs they began to hurt so bad I can't do anything with them until the pain stops. I have a lot of pain in my hip, back and legs, everywhere really but mostly in these areas. The pain in my back is so bad at times I can not stand up straight, when my hips hurt its hard for me to walk and nothing I do seems to help besides time. What do you think is wrong with me? Please help...