This definitely sounds like it was some kind of allergic reaction, probably to juice?
I have an autoimmune disease where my body reacts to stupid things. When I first quit smoking in December 2011, I got sick as a dog - for months. I guess it's what someone already called "smoker's flu?" My head was draining globs of glunk, I was coughing, I was weak, but yet, I felt better in a weird way, as well. It took months to finally get 30-plus years of smoking out of my body, and now I rarely have any head colds, etc., like I used to have all the time. But my autoimmune disease (called mastocytosis) is probably what kicked the smoker's flu into high gear. My body did a "OMG, she's stopped smoking. We have to invade ... something, anything and protect her!" and I got so sick.
Now, if someone comes around me with some horrible, catchable disease, my body will invite the bad stuff right in and probably hand 'em a beer. Bodies can be soooo stupid.
To the OP, I'd definitely say do some experimenting. When I started vaping, I was sure I must be allergic to the juice, but, in the end, I wasn't.