"For treatment, my counsellor said that there's really no way control them other than avoiding triggers."

This is terrible advice. Avoiding triggers only feeds obsessive thoughts and reinforces the mistaken notion that they (or what you fear) are dangerous. In the short-term, avoidance can provide temporary relief, but in the long run, it makes the problem worse.

Feared situations and anxiety more generally must be faced rather than avoided to make progress with anxiety disorders. This is obviously difficult, takes time, and must be done gradually--preferably with the guidance of a knowledgeable therapist.

Even if your feared situation is some wild hypothetical that can't be created as a means of "exposure," and even if it is something that is extremely unlikely (as I'm guessing it is), the way forward is to start working on accepting your feared situation, accepting the uncertainty you have, and working on being okay with that uncertainty. A good therapist who specializes in anxiety disorders should know all this and more. S/he can guide you through the necessary steps involved in exposing yourself (even if only mentally) to feared situations and correcting distorted thought processes through Cognitive Behavioral Therapy (CBT).

This book is good:

http://www.amazon.com/Freedom-Obsess...nathan+grayson