What Causs Involuntary Jerking Movements In Body?

I have been experiencing involuntary jerking movements that leave my muscles in a more relaxed position, however these movements happen throughout the day. My doctor has prescribed 1st Bactrim but that left me very anxious and upset my stomach. More recently he prescribed for me Baclofen 10mg 3xday. It is not giving me any side effects but is not controlling the spasms. I have a stent, I have fibromylgia, arthritus, dibabeties II (hopoglycemic), IBS, high colholosterel, low throid, Asthsma,and I am 62 years old. I currently take daily vitamins, 325mg asirprin 1xd, Lipitor 40mg 1xd, Vasotec 10mg 1xd, Prozac 40mg 1xd, Neurontin 300mg 2-2xd, Oxcontin 10mg 1every 8 hours, Spiriva 1 inhalation daily, Trazodone 100mg 1xd, and Ubiqunone Co Q-10 100mg 1xd. Do you have any suggestions as to what medication might be a good fit for me or an explaination to as what this jerking might be? Thank you so much for your time. Phalle