What Causes Appetite Loss, Headache, Dizziness, Nausea And Lower Back Pain?

Hi, Looking for a bit of advice whether this is something or nothing. For the past four days I ve had no appetite, been feeling constantly nauseous but have not been sick. I also feel constantly hungry but begin to feel even worse if I do eat something. I have a very powerful headache on the top of my forehead that only slightly dulls when I use paracetemol or ibuprofen, very immense pain between my shoulders and in the middle of my lower back both areas heat up immensely and go bright red then back to normal colour but with cold, clammy skin and still hurt and are tender to touch. I get very warm and feel a little dizzy and then half an hour later I m freezing cold but still sweating. My upper arms, thighs, ankles and feet also hurt immensly. Massaging the tender areas helps relieve the aching but only for five or so minutes. I only have a headache when I first wake up but within twenty minutes of being awake all symptoms return. Napping through the days does not help nor does eating/drinking water it makes me feel worse. My symptoms seem to be getting worse everyday and I m not sure what to do.