Thanks for writing to H.C.M.
By your query I came to know that you are having a tinny lump on your neck and along with this you becomes tired and feels breathlessness even after minimal work.
According to your clinical history you are having lymph
node in neck, and since you have problem of tiredness
and short of breath therefore it becomes necessary to investigate your chest for primary infection.
Here you are advice to do-
1- X-Ray chest ( P.A.View ).
2- Blood- CBC, ESR
, Mantoux test
3- FNAC from lump.
By above investigations one may get the clue for diagnosis and accordingly that may be manage.