Lantus and wtf

I have been on Lantus 40 units 1x per day and I too have had excruciating back pain that runs from my neck down to my waist and in both shoulders. Also I have a cough too which started with a cold but the cold went away and the cough did not. I also have woke up in the middle of the night sweating and shivering never had this before either. When I asked my doctor about this he said oh sounds like fibromyalgia WTF?? Never had this pain before or any of these other symptoms and it starts right after starting a new med(Lantus) I might not be an md but it doesn't take a rocket scientist to figure out that it is the Lantus causing this . Why don't doctors want to admit that every drug has some side effects and I am starting to thing insulin has the most.