During Phsyotherapy for a heel spur the therapist rolled a hard foam tube up and down the back of my legs. It caused such pain that I could hardly stand it and broke out in a cold sweat? What's going on?

This might not necessarily be a sign of anything other than tight muscles. Using foam rollers (aka "bolsters") to massage and loosen leg muscles has become a very common training activity. Most people find it VERY painful when they first try it. If your therapist says that it's normal you should believe your therapist.

People with fibromyalgia may find such activities even more painful than others who do not have fibromyalgia. If you have been diagnosed with fibromyalgia, you may find that you are hypersensitive to certain stimuli. Make sure anyone treating you is aware of your diagnosis. They may need to start off a little more gently and "work their way up" to firmer pressure. The bottom line is that any activity that causes severe pain is unlikely to be repeated, and it would be a shame to discount a therapy that might be helpful because you can't stand the treatment. Speak up and be sure that any professional treating you knows how you feel. This is an important part of any professional relationship and fosters trust and a good working relationship.