They could very well be enlarged lymph nodes due to the throat infection.
When the body is fighting an infection, lymphocytes multiply rapidly and produce a characteristic swelling of the lymph nodes. Lymph nodes act as filters or traps for foreign particles and contain white blood cells.These cells then destroy foreign invaders.
The anterior cervical lymph nodes, both superficial and deep, lie above and beneath the sternocleidomastoid muscles.( the muscle in the neck)
They drain the internal structures of the throat as well as part of the posterior pharynx, tonsils, and thyroid gland.
So any disease in any of these structures will cause these nodes to enlarge.
Thank You so much. I am a little nervous still. I am feeling some upper back pain as well. I am not having a problem swallowing no blood or any other issue. I am a little worried about esophageal cancer.