Robert,
Yes, this illness can make you extremely suspicious of symptoms - of just about anything (especially if you start out with doctors who treat your oral symptoms as nothing to worry about).
Fortunately, after I completed my treatment, my oncologist became my primary care physician, and year after year, he keeps telling me to call him about any symptom -- anywhere -- that is a concern. Because he knows my history well, he has a great perspective on things and sometimes even when I think it's nothing to be concerned about he orders a test or two because he wants some peace of mind.
Just keep asking questions and staying informed -- I'm convinced that's going to be a major factor in improving the survival rates for this illness.
Cathy