Here's the story...
I think in the long list of events that took place, I wouldn't rule it as evil as more Chaotic. You spoke up against becoming a hired hitman to the Queen [good action imo], you spared your attackers life (most parties I see wouldn't have done this after a party member or two died)[good action imo,] you lied to save the mans life [chaotic imo, slightly good imo,] whacked him every few hours to keep him KO'ed [hard to judge alignment shifts here for me, maybe a little to evil because you are repeatedly doing harm to someone helpless imo,] and you spent time to conceal his condition while taking care of him (I'm leaning good action here.)
If your game is hardcore keeping track of alignment points, I would judge you got a point in Chaotic. Good intentions balanced with some wrong actions/ results. You kinda snubbed your noes to following the direction of a law figure and followed your heart for judgement calls, putting you more in a Chaotic alignment to me. There are many things we don't know that might have happened the whole adventure time. I would think someone might have tried a rushed diplomacy in combat to calm the man into talking (might have failed.) Your warlock was in the right in his actions if you wanna follow the Evil alignment. Since he missed you could have tried to calm him down and stood between then to try and get him to agree to your plan. I myself see too many problems with taking prisoner the druid with your warlock not being on your side with his fate. He could have thought something was up and checked on the man, seeing through your lie and finished him off.These situations are tricky. The best thing I would say is talk to your GM on your feelings on the situation and how you felt wronged in trying to do the right thing. Changing your alignment takes time. I think this event might give you more incentive to become evil, but shouldn't have just changed in over the last week or fortnight.
Hope this helps some