Yes it’s great that you posted here as we can then easily check out what the history of this issue is. 
I think everybody has trouble staying focused in meditation - it’s just a matter of practice and gently bringing your focus back when you find it’s wandered. I like to have music that’s always the same and dedicated to meditation only (I use shamanic journey drumming) as when I notice the music then I may find my mind wandered and I can refocus faster.
This sounds like you’re dissociating and need to get grounded. Or you could say, your astral form is out of alignment with your physical form. A moving meditation like tai chi, or just going for a walk in nature, going to the gym or other grounding physical exercise will help. At the lest, get outside and get your feet on the grass. More here: What is grounding?
If you didn’t invite it, banish and cleanse. if you has wanted to work wit hit, you would have evoked it by now, but something in you has decided to be wary of it, and I think you should follow that intuition.
Yes, you’re doing great so keep doing what you’re doing 