How to use these following words?
Giddy and Dizzy. What does it mean?

Question

Answer

Giddy: really excited about something to the point of being giggly or silly. "She was giddy with excitement"- When you are so excited about something that you can't contain the excitement. 
Dizzy: When you feel like you are going to faint. You could say "dizzy with excitement" but that isn't used as commonly.

Answer

Dizzy is a synonym of giddy. 
And It means having a sensation of whirling, with a tendency to fall

EX; They climbed to a giddy height.
EX; I stood up too fast and felt dizzy .

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