Can anxiety cause me to feel depressed?

Yes!!! For sure. I was in a really dark place and didn't want to be alive anymore. I worked up the courage to tell my mom and was brought to the doctor- took the tests and my doctor said that I have such severe anxiety which causes me to not want to live. The major anxieties and struggles of wanting to be perfect and the best made my life unenjoyable. So yes, it can cause you to feel depressed!

Yes. It can lead to repetitive or depressive thoughts and thus, to long periods of sadness and depression.

Yes. Typically anxiety (as Charles Darwin who struggled with it himself pointed out) is adaptive in the sense that undertaking risky activities or being in risk-filled places can cause anxiety, which would in turn cause us to avoid those activities or situations. There are times however, when people feel as though they are under constant threat and people experiencing anxiety are unable to cognitively locate the source of it either in an activity or environment. After some time with this condition, a person will begin to avoid all activities and situations resulting in disconnection with the outside world, and be actively be motivated to do as little as possible -- the result is depression. Many people have little awareness of whether or not they are experiencing anxiety, because it can easily be confused with motivation in the sense that both states will cause us to heighten our focus and attention, so in my view it's unlikely for developmental depression to be caused by anything other than anxiety, whereas psychiatric depression is likely rooted in abnormal brain development as it pertains to brain chemistry.