Proper detailed history is required . Dizziness can be of many reasons , his
sugar levels and bp is normal . So somtimes its due to problem in ear , Or while waking up from bed he shud turn on one side and get up slowly , coz suddenly if you get up from bed den also few people have this kind of symptoms. For further details and treatment Can take online treatment consultation.
Next Steps
If along with dizziness headache also there and it persist for long , it s always better to do CT brain plain.