Heh, I know how it feels. My voice actually got lower for about a week because I was new to vaping and I was trying to get into my friend's scream-o band XD
My throat felt like heck. I was coughing up nasty loogies. After a while, I got used to it, I guess, and now I don't cough as much. I also stopped coughing up the nastiness. I think it is the bad stuff you get from smoking analogues. It is the transition that got to me. Once, I tried to do a direct e-cig-to-lung puff (where as I usually did the mouth inhale then "gulp") and it really irritated my throat. My advice is to do the mouth inhale then gulp to reduce the irritation. Good luck!