D.H.E. 45
(dihydroergotamine mesylate) Injection,

I don't think DHE has been discussed here.

You said "So my question is whether DHE will do the same thing to me by removing the trigger that tells me I am about to cross the threshold into dangerous territory that will make my condition worse on a long term or permanent basis."

Did you mean "removing the signs that tell me I am about to cross the threshold...."

Triggers cause an increase in symptoms. Signs tell us that we have pushed the limits. Loud noise is a trigger. Trouble understanding voices is a sign that one is pushing the limits.

I think you are making too much of "cross the threshold into dangerous territory that will make my condition worse on a long term or permanent basis." Pushing the limits rarely causes permanent worsening, just a relapse and need to recover,, again. One would have to continue the activity long beyond any signs of overdoing it.

Learning to moderate our activity so we do not go beyond our tolerance levels is most important. I don't let a med change what I know are my limits. I have learned the very subtle signs that I am starting to push my limits. If I go to a restaurant, if it is noisy, I wear my foam ear plugs. I don't wait to sense I have over done it.