Mine jerks too but it does not hurt and is usually when I am reclining in bed with pillows using my laptop computer like now.  At least they do not hurt.  I am past morphine and on methadone which is great stuff along with my neurontin generic version that tastes terrible.

 

On the senna it is a leaf I buy by the pound sealed sack for the discount at the health food store and I grind it and Flax seed from a california Winco store or the HF store which is more expensive and buy psyllium seed grind it too and buy wheat germ flakes bulk from winco and after ground up keep in freezer mixed and add a heaping tablespoon to my morning cereal which is mini shredded wheat with a banana sliced on it and I have lost 120 pounds on veggies, fish and eggs and soy milk, soy powder and vitamins and water aerobics.

 

Doing Great and my Kaiser HMO lets me have accupuncture monthly, had a pain management class and will be taking a hypnosis class in December. Can't complain with my care.