My 30 Yr Old Son Has Had Two Bad Ear

My 30 yr old son has had two bad ear infections since April (His last was when he was about 4). also, since that time or maybe earlier he has had a large lump under his chin. this has gotten smaller after the antibiotics from the ear infections, but has not gone away completely. He says it doesn't hurt and today when he went for this current ear infection, the Dr said he has several swollen lymph nodes. The Dr has ordered some blood tests and told him to see an ENT, though he can't even get an appt with his primary physician. I am concerned, especially about the swollen lymph nodes. Should I be?