There are many different causes of such dizziness.
Basically, the causes are divided into two, Peripheral and Central.
Peripheral causes are causes in the ear, like BPPV, labyrinthitis, vestibular weakness and, Meniere's disease.
Central causes are causes due to other conditions like cervical vertigo, cerebellar conditions, strokes, etc.
Systemic conditions like heart causes, anxiety, low BP, infections, disease conditions, etc. can also cause dizziness.
One condition that can connect your symptoms is cervical vertigo. Cervical vertigo is dizziness caused by cervical disc lesion, cervical disc lesions can also cause a pain in the neck. It would not cause eye or tongue symptoms however. A skull base lesion can also cause all your symptoms like pain in the neck, dizziness, eye and tongue symptoms.
You should first go to your PCP/Family Physician to rule out all systemic causes of such dizziness. You need a full body checkup for this. You need a thorough physical examination to rule out any causes like low BP or infections, blood tests for anemia, sugar, electrolyte abnormalities, liver and kidney diseases. You also need to be checked for cardiac conditions and tests to rule out neurological conditions like TIA, MS, etc. If necessary a CT or MRI of the brain is needed. You should also discuss about cervical disc lesions and skull base lesions for which a CT or MRI will be helpful.
Meanwhile you can do the following rehabilitation exercises which will help with the dizziness:
You should also take Cap. Benadryl twice daily, this helps with dizziness. It may cause some sleepiness.
But you must show to your doctor at the earliest.
Hope I have been able to clarify the situation for you and helped in resolving your query.
If you need more help, please let me know so l can continue to assist you.
Thank you and I wish you the best of health - stay safe!
Dr. P. Jyoti