Are there any ways to suffer from anxiety without knowing it?

Yes: Many times people are feeling a sense of unease and discomfort without being able to identify the feelings as related to anxiety. Take a look at the thoughts that you are having and the things that you are telling yourself about the activities throughout your day to help identify if you are responding in an anxiety producing manner. Once you have identified the triggers, address them.

Anxiety: Some people adapt to anxiety like some adapt to a low grade temperature. It becomes familiar and thus can seem normal. Best.