Sounds like too much of a good thing! Go really easy the next time you try it - don't use alcohol at he same time - it "muddies the water".

The puking is usually from a big drop in blood pressure. If you are young and thin, and tend not to eat enough (common in the under 25 age group), you will be more affected.

Are you trying to medicate yourself, or get high?

No matter. Go slow. Count your inhalations, and take much less than you think you need. Then you can increase/decrease the next time.