Welcome to Healthcaremagic.
Thanks for your query.
I have gone through your query and understand your concern.
Just an sore gum can not be a Oral cancer
It may be due to local infection in base of teeth and gums.
As far as your arm pit lump is concerned, it may be due enlarged axillary lymph nodes.
The usual causes are infection.
But breast cancer
also cause the axillary lymph node swelling.
Thus i advice you to have through physical examination by your Primary care
physician and then consult a dentist
for further management.
Chin ache and muscle ache are due to refered pain from infection in gums or muscular pain
Please check ELISA or Western blot to rule out HIV.
Hope this helps.
Please reply for further queries.
Wishing you good health.