What Causes Severe Deep Pain On The Left Lower Section Of My Back?

I don t know if all my symptoms are related. Started with tingling in 2 middle toes on my left foot. Then severe deep pain on the left lower section of my back with extreme skin sensitivity like a sunburn. After that a small rash on my lower left hip on the side that turned into blisters...slightly varied in size & somewhat running in lines but not quite...like 2 or 3 together in a line. The rash is extremely painful, not itchy and I am so sensitive there and elsewhere that I can t stand clothing touching me. I live in Ontario, Canada, and proceeding this rash I spent two days pulling river rocks out of a lawn and a wheel-barrow full of rocks fell over hitting me in the lower leg and possibly in the back, plus I was whiplashed in a car accident years ago...so the back pain could be related to both the rash and prior or recent injuries. There is a small black dot in the middle of the rash...could be a tiny freckle or an insect bit but I would think that a rash from a tick bit would be itchy and this one is not. I m 56 years old and considered myself in good health prior to this. Also feel exhausted, pain keeps me up at night and the first day of the rash I felt light headed but have not felt particularly feverish. I have no idea whether I had chicken pox as a child but if I did then I would guess I may have shingles. I would appreciate your ideas on what this may be. It is impossible to get a doctor s appointment here and I may be squeezed in with a doctor who barely speaks English later today for 10 minutes but since his communication with him in English is difficult I would like to walk in with an opinion to present. Thankyou, Deborah