I've got some questions to ask first...Did you have a stroke or Bell's Palsy? Do you recall what kind of symptoms you had 2 years ago when you had the stroke or was it mostly just the facial drooping? Also don't take this the wrong way as I'm not trying to say you didn't have a stroke but I would like to know as a couple things are really standing out to me.

First of all, I'm curious because a stroke is completely different from Bell's Palsy. Bell's Palsy is more of a temporary condition of facial muscle weakness / drooping that is caused by some type of injury to the 5th cranial nerve which is usually due to a viral infection; however, it can cause residual or long term side effects in some such as the facial drooping but generally speaking, this condition is not associated with a stroke.

If you truly had a stroke which I'm not saying you didn't, it could definitely cause long term loss of facial muscle control or facial drooping AKA residual but depending on the type of stroke I'm kinda shocked your not on any type of medication such as antihypertensives, statins, anticoagulation or anti platelets to prevent another.