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1.Your symptoms, findings, signs are more towards infective process with in the body which need to evaluate.
2.The swelling in the neck and the axillary regions / arm pits are enlarged
lymph nodes.
3.Lymph nodal enlargement is seen in case of any infection / inflammation / malignancy, localised or systemic.
4.In this case i would recommend to get a CECT - contrast enhanced computer
tomography thorax and abdomen - though its
radiation need to evaluate the cause then only one can treat the disease.
5.An FNAC - fine needle aspiration cytology of the lymph nodes will help to find possible cause even before CECT.
Good luck.
Hope i have answered your query,
any thing to ask ? do not hesitate to ask.
http://doctor.healthcaremagic.com/doctors/dr-ganesh/62888