What Does Extreme Fatigue, Dizziness, Cramping And Swelling In Joints Mean?

i have been very fatigue for the past few months, i am often dizzy and light headed, i have had severe cramping, chills, joint paint, stiff neck, headaches, nausea, and have been sick with a "food poisoning" like sickness 3 times in the past 2 months, I have taken a pregnancy test and it is negative. also my head is balding in spots and feels swollen. I wake up with my hands swollen and hurting and my knees have been swollen and sore the past week. Whats wrong with me... I feel like I'm dieing. I am a 25 year old female.