But I've already invitied the unknowable, quite literally.
Maybe, but every invitation can be reversed when new information comes to light!
Do I just need to study the phenomena more? I'm actually very scared of all this UFO business, and most of the time new knowledge only adds to my fear. I know that fear supposedly feeds STS, but paradoxically this only makes me more scared.
Reading the material that has been suggested to you, doing EE and learning about what is healthy to eat will all start the process of gaining knowledge, which as the Cs have said "Knowledge protects". It also will help to raise your frequency resonance vibrations which will make you unpalatable to 4D STS entities. You cannot help yourself by getting answers from others, part of the learning process is through reading the material yourself, having "aha" moments, connecting the dots, etc.
And, you are correct, fear feeds them. Seeing how you have so much fear, I am thinking that if you haven't already, stopping the eating of gluten and dairy will help your mind and emotions greatly.
If you consume alcohol or drugs, know that these decrease your FRV, makes you more palatable.
If you could read the books and other material with the thought that you are gaining knowledge which will protect you instead of seeing fear in everything, this, too, may help you.