Angioedema?

A few weeks ago the left part of my lower lip started swelling sometime in the night. Then last night, it started on the left side and spread to the whole lower lip. I guess it's the Guaifenesin I've been taking, but I don't think I was taking it last time. And now I see Angioedema is a rare adverse effect of ACE inhibitors and can be life-threatening if it involves the oropharyngeal area.