can singulair cause swollen lymph nodes

I am a 32 year old female, Over the summer I started taking singulair for my mild asthma. At the time I also had a swollen lymph node in my neck and did not suspect a connection. However, I also had severe headaches and was told to stop the singulair to see if it helped... since I was far away from home for an extended period of time... the headaches went away and I went to the dr to get the lump in my neck checked and he couldn't find it... so anyway, I went back to my allergist and she suggested I try the singulair again and I have been takingi t ever since... well the swollen lymph node is back and has been back for atleast 6 months... I also have more migraine type headaches than I used to, but they go away fast with advil and are tolerable... could the swollen lymph node in my neck be from the singulair... My doc said no, but it was there for a couple of weeks when I took singualir for 2 weeks and then went away,,, then when I started it again it reappeared and has been there for months and I am still taking the singulair... what do you think?