i havent had night sweats or loss weight...

now i havent been to my primary hospital in too years and the last time i went was for my lymph nodes hurting they were so swollen but i had a viral infection. i finally returned for my first checkup in 2 years and my doctor told me that some doctors had contacted him 3months ago reguarding my lymph nodes. he say they were concerned, he asked me if i had night sweats, weight loss while chwecking my glands, i was scared at this point because why would they call him and i havent been there in 2years i dont get it. i always feared catching hiv. nowt instead i gained 22 pounds since the last time i been there. he ordered me some blood work too be done too check my glands which wasnt swollen, in fact they healed 5days later after i seeked treatment in the er 2 years ago. what is this doctor trying too tell me. why are they treating this with so much concern? should i be worried