I do believe in guardian angels and I am pretty certain that on at least two occasions in my life I have seen my own. I sure hope my loved ones that have gone before me aren't present for my sins. My sins have been forgiven by the sacrifice of Christ on the Cross. Past, present and future. I'm not proud of mine, they are a cause of deep shame, but I'm granted justification in the eyes of the Lord due to Christ.
Frankly your viewpoint terrifies me. There are any number of explanations for your experience. I don't want to list them because I don't want to knock your experience. But the Holy Bible is very clear on such matters...
From what I read, my experience is not unique. Others have experienced the same, and hence they’re called Visitations, instead of dreams. What I’ve experienced never terrified me. On the contrary..it gave me peace.