Thanks for writing your query to us.
Since you are having low grade fever
since 1 month along with soft lump near arm, possibilty of lymph
node enlargement cannot be ruled out. Consult your doctor & get yourself examined to exclude any lymph node enlargement. Urinary infection does not last for such long duration. Normal heart rate
on ECG is 50 - 100 beats per minutes, so your ecg shows a normal heart rate dont worry about that. In addition to that any kind of fever, anxiety
can also increase heart rate on ECG. A low grade fever of long duration along with swelling needs to be evaluated.
Wish you good health.