The prescription of Stugeron suggests that your doctor felt that the cause of your imbalance, the sensation that the room was spinning lay in the malfunction of the balancing mechanism in your ear. The pain in the neck and arm do not favour this possibility.
I suggest you consult a senior neurologist or neurosurgeon in your neighbourhood and seek advice on whether there could be some abnormality in the neck or back of the head that may be responsible for your symptoms.