hello and welcome to HCM,
These are some points to ponder:
1. Whenever you are involved in any injury, some amount of soft tissue
swelling which manifests as lump while swallowing may be present which may not be seen in any CT or x ray
. This however will gradually subside.
2. If you were unconscious for a long time, find out if any intubation
was attempted on you. Any of these can cause a feeling of lump which again will subside in due course.
3. There are no veins which press on the back of your throat so rest assured
4. Since you have multitude of other symptoms such as ringing, pain and headache, you may be having a situation called diffuse axonal injury
which can cause even the feeling of lump. This requires further investigation and treatment with your consultant.
hope these help
Dr Sriram Nathan