Ok, I grant you that this deserves more attention than a lot of the ranting about fluff going on around here and I understand that you wanted to draw more attention to your thread but try to be a little more understanding. This isn't a question that everyone can necessarily answer so it takes time for someone who can to stumble across it and answer.
First thing I'd say is that if you're going to try spirit work you need to understand them. You mentioned that you "commanded" the spirit to show itself. I do a lot of spirit work and I never command anything of the spirits, I ask them. Think about it in terms of yourself, if someone came up to you in the street and just shouted at you "Come talk to me!" Would you respond positively? On the other hand if they asked "Do you have a few moments to talk to me?" You might be more inclined to do so provided you were in the mood. With any spiritual work it's better to approach it with a gentle hand (excluding banishing or binding but they're not strictly necessary unless you mess up, just highly recommended skills). That's the second point, make sure you at least know a banishing ritual before beginning spirit work and always perform it after wards even if everything appeared to go well, if possible also do one before hand but if you're checking for a haunting that's obviously not possible.
Sorry for that mini lecture there, if you knew those things I apologize but it'll still serve to help others.
Now unfortunately I can't say whether it was the veil between life or death or not as I don't know the exact feeling you sensed but I can help you test it. If it felt like death energy then you obviously have some experience working with it so I won't waste much time on describing that. Personally I normally sense the veil best outside and by water but then I suspect that's largely because I just feel more peaceful there. So if you want to sense for the veil then I recommend meditating at the time. Perform a banishing ritual such as the LBRP and simply begin. It helps if you know how to astral project too although you can simply sense its presence. I find the veil itself is difficult to see at the best of times as its contents is largely expressed as the will of the castor I typically see it as a hazy image until I actually step through it. Regardless of the image though you will sense the death energy in it. If it help then you may need to find somewhere you feel at peace and actively seek out the veil just so you get a sense of what you're looking for.
If it is the veil though then I wouldn't rule out a haunting offhandedly. Spirits are often found near areas where the veil is thinner and I'd recommend doing some quick banishing and smudging white sage just to help keep them out.