Hi doctor. i've been feeling weak lately and i wake up with a nausea every morningand feeling tired sometimes i get server back pain in such a way that i cantveven stand what can you recommend for me to buy until i can go see a doctor?

Depends on details: If in lower back, some causes of pain there include: back muscle strain, back ligament sprain, fractured vertebra (spondylolysis), slipped vertebra (spondylolisthesis), herniated disc, spinal stenosis, spinal arthritis, urine infection, kidney infection or stone; tumor in the spine, kidney, or elsewhere; fibromyalgia, etc... With such a big list of possibilities, one's doctor needs to evaluate.