I can assure you that his is not a fatal condition. You have a well-organized axillary abscess
it seems from your report and as a result of the abscess, the surrounding lymph
nodes are swollen up. Since you have taken antibiotics and the abscess has not gone away, it means that it has organized itself. Proper management in this case comprises of a drainage
of the abscess so that the cavity is completely cleared of it. I suggest you go and meet a surgeon for the same as this would lead to resolution of your symptoms.