Frustrated

My obsession at the moment is eternity. No matter if it’s eternity with an afterlife or without, it still gives me the most unexplainable fear I’ve ever experienced. I try to tell myself it’s just OCD and to let it go, but my mind keeps trying to convince me that it’s wrong to let it go. Almost like a fear of letting go of fear. I can’t seem to get myself to believe there is nothing wrong with eternity, especially when it feels wrong when I think about it. Is this a OCD symptom or am I just going to be anxious about this for the rest of my life?