It will recover in veg. the question would be would it be worth adding an addition 2-3 weeks of veg to get it back healthy enough to switch light cycles into flowering? Maybe, maybe not. I probably would have just ditched it as well and started fresh. Just my personal opinion. Its also my personal opinion, if you make another attempt, dont bother topping it or anything. Just let it grow, see how it develops, and learn from the experience. Each batch experiment a little more and see how it effects the plant. In 3-4 batches you will have gained quite abit of experience and knowledge.