You obviously didn't do much research. There are stickies with newbie info. Susan~S likes to post a copy and paste from there with decent beginner info about nic, vg/pg info and more. Even then, I don't think the nic caused your problem. A nic overdose causes temporary symptoms. And like anything, you can build a tolerance to the nic and be able to handle more without problems.
Believe it or not, I would like to know what caused your problems. I still strongly doubt it was vaping, but I am open to seeing proof. So far, I havent seen any. I see bad timing and coincidence, but that's it. There are too many people on this site that have medical proof that vaping has helped them for me to write it off. Your problems could be indirectly vaping related, a severe allergy to an ingredient in juice, just being reactive to high humidity even. Heck, even a bad juice company adding unsafe ingredients. I believe it was Suicide bunny that used titanium dioxide for flavor... If you were excessively reactive to something like that, it could be bad, quick. It could also be something completely seperate and just bad timing as well.