Suggest Treatment For Severe Back Pain

I am currently on blood thinners as I have a history of blood clots. I have had a back ache on my left side for over two months now, while camping a month I tripped over one of our dogs on a down hill slope, I slammed my forehead which went back and I heard a pop in my neck. since then I have had head aches every morning, night and in between. they are from mile to moderate with terrible cramping in my neck. I have since developed cramping in the joints of the left side of my body, which includes fingers, arm, elbows, shoulder, neck, etc. last night at work I got light headed, with a headache, weakness, and felt as if I was to pass out. Again, I still have the left pain/back ache for the last two plus months. could this be related to my blood clots, or something else? And when I fell and snapped my neck a month ago could this have made things worse? i can t even spell it but it is authritis in the spine where the cushion has disappeared and it is bone on bone.