Your symptoms are vague but still with complaints of sinus pain , difficulty in focusing, nausea, fullness in ear etc., I would first suggest to get the relevant investigation done to rule out any underlying head injury
. As for tightness in the neck and shoulder it may be a musculoskeletal injury but at the same time priority is to rule out cervical spine
injury. Off course without any numbness or weakness of upper limbs, the probability of cervical spine injury is not very high.
1. CT scan brain with cervical spine
2. X-Ray cervical spine (AP and lateral view)
In post traumatic cases CT scan is the most important investigation as it can precisely diagnose any intracranial hematoma
or skull fracture
as well as sinus bleed.
Also keep a note of whether you experience any of the following:
Headache not relieved by pain killers, vomiting, blurring of vision, drowsiness
, problems with balance, fits, black eye , ear or nasal bleed.
Advice : After getting the scan see a Neurosurgeon or at least a ER physician and get a detailed neurological examination done.