If this is, in fact, a spirit, the absolute first and foremost thing you should do is remove ALL of your Tarot from that room. I have had dealings with similar things several times over the course of the past twenty-seven years, and all of those people who tell you "well, all you really need to make sure you don't do is NOT use a Ouija Board" are nutcases: Tarot can also provide a "portal". Anything can become a tool for a negative spirit, from your TV to your cellphone to your Tarot. Even if it's NOT a negative spirit or entity with which you're dealing, I'd still move your Tarot, just to be on the safe. So much time and energy goes into charging a deck--do you really want something like THAT charging them FOR you? I think not! And if it's NOT an actual presence, clearly the room gives both you and your husband a "negative vibe", so you really don't want your Tarot in an area that you associate with negativity.
Having said all of that, I've been reading up on parapsychology and the paranormal (and have had more than my fair share of experiences with all of the above) since the ripe young age of 13 (that's thirty-years' worth, y'all), and your experiences with attempting to sleep in the room are very much in line with the "Hag Effect", aka Sleep Paralysis (which is likely why someone else pointed you towards The Nightmare painting and song). Many people's "paranormal experiences" can be chalked up to Sleep Paralysis, which can feel very much the same as a psychic attack. You might want to further research that.
If in your case this IS a negative spirit or entity, people can sit here all day and tell me that ALL paranormal "negative energies" are spirits if they'd like, but I've had numerous experiences with these things, and I can tell you first hand: not all things that "go bump in the night" or attack you spiritually are merely "angry dead people". Am I saying that demons are real? Why, yes, yes I am. But they aren't the only negative non-human entities out there. Many folk traditions also describe negative non-human entities: the Boo-Hags of West Africa and the Southeastern United States; the Dark Fae of the British Isles; the Puckwedgies of New England (Native American); the list goes on and on. You should definitely research what "indigenous" entities there might be in your area (including Elementals, which are everywhere, and are NOT always negative, but if you've ticked them off, poor you!), as well as consider that this might be something even more "unsavory". I don't know what your religious background or spiritual convictions are, but I have personally found that the Prayer of St. Michael The Archangel works well in instances like this, if you ARE dealing with a non-human entity that is not of the "indigenous" (Elementals; dark energies from local "folk traditions") variety. When dealing with Elementals and "folk spirits", it is best to appeal to them from THEIR "tradition", rather than yours. For example, if you've angered an Earth or Air Elemental (and your case definitely lends itself to either of those), you would attempt to BALANCE what you've done to anger them by appealing to their energy (offerings of crystals or incense). In the event of a "folk spirit", you will need to do heavy research into what local peoples did to "ward off" those energies (for example, to "ward off" a Boo-Hag in the Southeastern United States, one would wear something light blue--a necklace, bracelet, scarf, whatever--and possibly paint their door lintel that same color, as well as placing a broom at the foot of the bed).
Prayer of St. Michael (scroll down for the more "user-friendly" short version):
http://www.traditioninaction.org/religious/b009rpMichael.htm
