Dealing with feeling vulnerable

I don’t know why, but lately I have been feeling so vulnerable all the time. I just feel so exposed and insecure. A few weeks ago I had an endoscopy done and before I was knocked out this amazing nurse put her hand on my shoulder and told me not to worry, that they are right there with me. I don’t remember the last time I felt so much peace. I feel like since that moment I am feeling even more aware of how vulnerable and uncomfortable I’m feeling all the time. What should I do to get out of this funk?