I'm glad you are doing better now, Treehouse. I hope you can have a good talk with your doc and see if he thinks it was the drug or something else. I hope you can get some relief for your back pain. I have never found NSAIDs to be helpful. I seem to be immune to them or something, even the prescription ones.

To get a baseline idea of what is your normal heart rate, you could try taking your pulse several times throughout the day and keeping a record. Then if you feel your heart racing, try taking your pulse and see what you get. This can help the doctor know how severe this symptom is for you.