Difficult to say without examination.
Regarding the sore throat - you may want to be evaluate for infections like strep throat. Viral causes, GERD, and post-nasal drip can also lead to a sore throat.
About the sores in your gums. One considerations would be gingival herpes. This needs to be looked at by your personal physician. If this is the case, antiviral treatment can be considered. Stress can certainly play a role if herpes is the case.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Kevin, M.D.
Medical Weblog:
kevinmd_b