HI LUMPS IN THE NECK CAN BE A INDICATOR OF INFECTION OR IT CAN BE ANYTHING SERIOUS LIKE CARCINOMA(cancer) sides of the neck has many nodes called as lymph node , its function is to trap any infectious agent in the body, swelling in lymph node indicates that there are infectious agents in body,as your lymph nodes are trapping those infectitous agents ,the size is increasing however in some case swollen nodes are a indicator of carcinoma its very possible that these enlargged nodes are presssing the vagus nerve which passes in the viscinity ,vagus plays a imp role in maintaining blood pressure,increased pressure on vagus can lower the bp due to overstimulation but a fever is indicative of ongoing infection i would suggest you a total leucocyte count diffrential leucocyte count complete blood count test to rule out any ongoing infection if its normal then a Fine needle aspiration cytology of enlarged nodes should be done to rule out carcinoma