What Causes Insomnia And Breathing Difficulty While On Narcotics For Pain Relief?

I ve been taking narcotics for pain with my specialist due to a chronic problem for some time. past few weeks and days especially feel very different. need more, can t sleep can t breath shaky. some of the Rex s have been changed the last few times and I think I m reacting poorly. how do I know if what I m feeling is from needing a pill or from too many. same reaction to a new medicine that was awful for me. soo confused.