it may be a couple of things, one someone is using a invisibility spell which is hard to master but I doubt this because usually those types of spells cannot effect a person without the person eventually being seen by screwing around with the environment or other people causing someone to be seen do to the fact invisibility spells were meant to do harmless things such as not wanting to be seen, although I have met some people with the forbidden power to violate and hurt or harm someone. But even then they usually end up being seen or caught or at the very least being seen. Now the solution to a person invading your house is to do a spell from any magick that works for you that enables the person to be seen or to be discovered. but don't worry usually invisibility spells only make you be not noticed instead of being invisible therefore the invisibility thing is most likely not the issue
second possibility, it could be a ghost, demon or astral projection that is attacking you, what you must do then is control the demon, bind him, or banish it to something, someone or send them somewhere else, if this is a curse I suggest sending the curse to someone else to deal with it, usually you will want to send it to someone that's pure evil, mischievous or bad, that way the curse will stay with them, usually you will want to find someone with little or no power and someone that's not a friend nor a enemy, but of course a curse usually or sometimes finds a way to come back at you or it's sent back to you especially if you bind it or banish it to another person which is why you should send the curse to a object rather than a person, and besides objects can't fight back nor send it back to you, so I suggest sending the curse to a street lamp or to a object and putting it somewhere away from the house and as far as from you as possible, remember if you send a curse to someone it will always or most of the time come back not only because of the 3 fold law but also because people send it back, banish it back or prays against it. putting it within a object lets just say a egg this is a spell I learned, you get a egg and absorb all the negativity and spirits within the house into the egg, then you bury the egg outside where you leave the negative energies there forever. Anyways evil can be controlled especially if you use a higher power with positive energies. I can tell you more about this if you e-mail me on here. But if you can't get rid of the evil inside your house then the biggest suggestion is to leave the evil energies behind, move away, doesn't mean that you move immediately but as soon as possible and do not tell anyone not a person, no one, and renounce and forget every curse or spirit that you did not banish after doing a spell, and do not try to think to much about where you are moving, just find a place that's peaceful and calm and bless your home with a welcoming spell welcoming positive energies, doesn't nessesarly have to be spirits, I just suggest happy and loving and compassionate energies, and feel then energies just flow within it and create energy full of life and love. But if you move I suggest waiting till you have enough money to move do not say out loud to the spirits where you are going, and start a new life somewhere else, and don't forget to summon loving, positive, happy, joyful, and peaceful energies and keep everything positive with everything that you do, and find positive energies and positive things to do and feel positive then your life will be much greater. And don't ever think or try to think about the negative stuff instead focus on positivity, and one last thing I suggest filling your house with positive things such as plants that's a symbol of life, a water fountain is a symbol of life, and objects such as angel statues, faeries, and stuff that will make you laugh whenever you look at it either in happiness or something comical, but make sure it isn't negative or evil laughter. just fill the house with things that will make evil scared to be there like happy things, and keep your house clean and have no dust or dirt on the floor, and keep salt which is a good symbol in the corners of every room. And try not to invite evil or negativity back in even if someone wrongs you, just bless them and bless yourself and let the power of good take care of everything, and once you invite a curse or any curse back it's all over. Sorry this will be the very last thing, be sure you go to a neighborhood that's protected and positive, never go to a place with negativity. that's all for now.