As per your explanation here, you have symptoms like soreness in back, as well your eye is sensitive with light. From both this symptom it is difficult to diagnose and guide you. I suggest to visit eye specialist for your eye problem and get your eye examine properly as well do treatment as per the suggestion of eye doctor. For soarness in your back you can use cold pack. But this can help only to control symptoms. If the soreness comes back then you need to visit again either orthopedic to check the spinal issues or else you need to visit dermatologist for examination of your affected area skin. And take treatment as per the evaluation. Till the time you visit doctor for proper examination and evaluation. I suggest if you have fever along with chills and sore back. Do symptomatic treatment like have medication (pain killer with antiinflammatory ) for fever. If fever is not there then you can also use cold pack on your back to reduce soreness at soft tissue level. Here I have given you generalise guideline since the symptom is not enough to diagnose and suggest the specific treatment. But i am sure if you follow all above guideline you will improve also. And do check with specialist at least once. Take care.