scared about lymphoma

Hi everyone im a 26 year old female and for the last year i have noticed several lymph nodes in my neck down both sides. I was feeling very run down about a year ago when i noticed them so i went to the doctors and they put me on antibiotics but they never went down my doctor just said some people do have palpable nodes and they are fine. Anyway its 1 year later and ive been searching online and it has really scared me reading about lymphoma so i decided to go back to the doctors and i voiced my concerns they didnt seem concerned but they said for my own piece of mind they would send me to an ent specialist. So far i have had a full blood count and a chest xray which were both normal. When i saw the ent specialist he didnt seem concerned about them but he said if i wanted he would send me for an ultra sound of my neck so i had that done and the doctor who did it said there were several but they were all within the normal size and nothing looked abnormal but he then said they cant be 100 per cent certain without a biopsy but he said they cant do a biopsy with everyone who comes in with swollen glands and because i havent lost alot of weight or been really ill he said that he is not concerned and doesnt want to send me for further testing. At this moment in time i am very worried from what i have read and its not like i just have one swollen its several and i feel like the doctors just think im mad. Anyones input would be reall good. thanks.