I’m assuming you mean another physical being molesting your body. In this case, make a space your own. Like your own room. Then, dead bolt the door. If you don’t have a dead bolt, go purchase and install one. If you have windows, lock them as well. If they don’t have locks, you can wedge a metal bar between the gap. Preventing it from being opened.
The longest I’ve been gone was roughly 8 hours. My body didn’t release anything during that time. If you’re really concerned, just get some depends, or adult diapers. lol
Physically, I’m unsure what would happen if your physical body were to die while traveling. You would likely become aware of the death at some point. Particularly attempting to return to the physical body. In my experience, if your astral body is assaulted, it can’t die. Though, it can be “damaged”, but not to a point of death like the physical body.
You sound too grounded. Practice trance work, letting go of the physical.
Interesting that you mention “anchor”. I have an anchor that extends from my tailbone. However, my anchor is below the physical realm… It has dropped to the depths of one of the demonic realms. It’s been like that for a long time, it may have always been that way for me.
It’s increasingly difficult for me to remain in the physical realm. It feels like I’m in an infernal ocean. My head barely bobbing over the surface. All it takes is a slight tug to pull me under; out of my body.
So, practice “dropping” the anchor lower. Drop your anchor in a realm you wish to explore. Then, allow it to pull you out. Fall back into it, let it pull you under. Also note, in my experience, demons can “tug” on my chain and pull me out of my body suddenly.
Also, the descending elevator sensation is useful for dropping out. Practice with that sensation. Hell, seek out an elevator locally. Go to the highest floor, then descend to the lowest. Lose yourself in the sensation, focus deeply on that feeling. Once you are intimately familiar with the feeling, employ it in your trance work.
Just before sleep is also a good time to practice soul travel. That moment between asleep and awake. Practice dropping out.