I think I'm coming late to this thread but I have notable experiences.
I have always felt that triptans (migrinal, imitrex, emerge and others) cause rebounds. I had a transient ischemic attack (TIA) in 2013. This resulted in my passing out while driving and mayhem ensued. My neurologist at the time led an extensive study and found that it was related to triptans. In 2015 I had an enlarged heart and arrhythmia develop. The Dr's felt it was related to a virus but they had no conclusive proof. I've always felt it was related to triptans which I still used at the time.