Does anyone ever know their thoughts and emotions concerning a subject is irrational, yet still get all the fears, urges, sensations and thoughts of OCD? 

That is exactly what ocd traps you into, you don't have to think and ruminate about those being illogical, it's exactly the opposite. Do not engage with them, realising they are false won't make ocd go away, you can't think of a tree removing its roots and goinf away on its own. Removing the compulsions and ignoring the intrusive thoughts is the key of unlocking this ocd mind lock

I appreciate the knowledge concerning OCD. 