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Janet,

It isn't usual for just three or four days off to make such a difference in the way you feel exercising.  I wonder if it doesn't have something to do with what ever you are taking for your ulcers.  Some of the newer medicines, while very effective, have a array of side effects that produce unexpected symptoms.  So do many of the herb and roots so popular these days.  Check with your doctor or pharmacist and be sure to tell them EVERYTHING you ingest. Let me know what you find out. 

Thanks.

George Dixon MD