swoolen lymph nodes in neck only, night sweats.

My 17th months old son has several large lymph nodes in the neck area only. At 3 months he only had one large one on the left side of his neck,I took him to a pediatrician and he said all was fine. At one he developed more in the neck area and another Dr suggested a ultra sound and a blood test for virus's. The ultra sound results came back with that he had several large nodes in his neck the largest was 1 cm by 1cm and that he did not have glandular fever. The dr sent me off saying the lumps indicate he has a good immune system and its normal for kids to have this!

I felt I needed a second opinion and took him to another Dr and said the only way they could tell if it was lymphoma was vai a biopsy? I have decided now that I will take him back to the pediatrion  but there will be a wait to get in and see him, so I hope someone can help me?

He has night sweats and sweats around the neck and head.
he has over 7 large lymph nodes around the sides of his neck.
The glands under his arms and groin are not swollen
The glands have never gone down
he has had small amounts of blood coming out of his nose
recently the lumps seem to aggravate him as he rubs the area and crys