Personally, I doubt that OBEs or APs are proofs for the after life. Maybe for ESP or that the consciousness can exist out of body while being alive (remember, you're still connected to your body while having these experiences), but not for the after life.
If you want to _believe_ (and it's a complete belief thing, you will only really know if one exists the time you die) in the after life, stick to one of the religions. Or create your personal one.
(Damn ... I can't believe I suggested something like that ...)
For this astral guardian thing ... well ... hmm ... what about ... astral projecting? I know you try it already, so continue with it, and eventually you will succeed and then you can talk with him/her/it/whatever.
If you want to _believe_ (and it's a complete belief thing, you will only really know if one exists the time you die) in the after life, stick to one of the religions. Or create your personal one.
(Damn ... I can't believe I suggested something like that ...)
For this astral guardian thing ... well ... hmm ... what about ... astral projecting? I know you try it already, so continue with it, and eventually you will succeed and then you can talk with him/her/it/whatever.