Pain in lower back shooting up into head and sharp pain when breathing?

Spasm. That is a muscle spasm. Take a hot shower. Apply heat to your back. Have your doctor prescribed a combination of ibuprofen which you can get from OTC and muscle relaxant which you need a prescription for it . Relax stress increased tension and make pain worst. If you do not have a doctor start with Benadryl (diphenhydramine) 50 mg at bed time and Ibuprofen 600-800 mg every 6-8 hours, and heat, or go to urgent care.