चक्कर आ रहे हैं

You use this phrase as a verb-based state. In Hindi, feelings often 'come' to you rather than you 'having' them. You add the auxiliary verb rahe hain to show it is happening right now. If you are talking about yourself, you say Mujhe chakkar aa rahe hain. The mujhe means 'to me'. It is a very flexible phrase. You can use it for physical heat or even after a wild roller coaster ride.

Use it when you have been standing in the sun too long. Use it if you skip breakfast and feel faint. It is great for social situations too. Imagine looking at a massive, confusing menu at a restaurant. You can jokingly say it to your friends. It works when you are looking down from a high balcony. It is the universal 'I need to sit down' signal in India.

Do not use this if you are just slightly confused. It implies a physical sensation of spinning. If you are just 'lost' in a conversation, use uljhan instead. Also, avoid using it in a serious medical emergency without specifying the cause. Doctors will need more detail than just 'circles'. Don't use it to mean you are 'busy'—that is a different kind of chakkar entirely!

In India, the heat can be brutal. Chakkar is a very common word during the summer months. There is also a famous Bollywood trope. Characters often get chakkar when they hear shocking news. It is a dramatic way to show emotional impact. Culturally, it is also linked to the 'evil eye' sometimes. People might think you are dizzy because someone looked at you with envy!

You can say Sir ghoom raha hai which means 'My head is spinning'. If you want to be more formal, you can use Bhramit. But chakkar is the king of daily conversation. You might also hear Chakkar khana, which means to actually faint or 'eat a circle'. Stick to aa rahe hain for the feeling of dizziness. It is the most natural way to express it.