Know this, that you are not alone in this problem. As an observer of enemy attacks for 10+ years having been a victim of them, I speak from total experience in saying that Magus Immotalis is correct in saying that the feeling are most likely not your own, and coming from the enemy.
The enemy will pull any little dirty trick in the entire book, and then ones you've never imagined. But, not to worry. Doing your aura of protection at least 2x a day to 4x should lessen it a lot to almost completely stop it.
However, I must recommend void meditation as well, as it's a excellent defense against these fuckers. Through void meditation which you can do at any time it's simply closing your eyes when you think this feeling is coming on, and then feeling things out. See what is going on through sensing. Or just tune everything else out, and see if your thoughts are your own. At times, our own thoughts will do this to us, and we may not even be aware.
Another reason learning about yourself is important. If there's any time you feel alone, as this is the dirtiest trick the enemy will pull on you, then know this well. You are NOT alone, you can come here any time, and you can also talk to Father Satan(even if you cannot hear him, he hears you every time you talk to him) any time you wish anywhere if you feel overwhelmed and you WILL get answers/help in time I guarantee you that. I have recently which I am happy about.
HAIL SATAN!!
SAY IT LOUD AND PROUD!!