It absolutely sounds like a tip stall. Thats why I always train my students to make the decision to go around early. Second, once the decision to go around is made, add the throttle and gain airspeed before trying to pull up. Its just like take off, only your wheels are not on the ground. Many new flyers wait to long to decide to fly around, and then they think they can just yank the plane up in the air. A Stik is going to try to snap on you, particularly if you have low air speed.

Rebuild and fly again.

Brad