Well, Billie does get panic attacks. Strange that that happened while you were him in a dream. It's really cool, though! How did you know you were him? What was the indication? I've never had a dream where I'm someone else. I once had a dream I was a snowy owl, but never another person.
This dream was a while ago:
I was with Billie, Mike, and Tré downstairs in my house at the dining room table and it was night. I was explaining to them how to play the classic Menth family version of the board game Sorry, which we call Cutthroat Sorry (more recently it was changed to Cutthroat Bloodbath Sorry by a cousin when more rules were added and pawns were taken as hostages). The way we play is you have a hand of five cards instead of randomly drawing from a pile at the center of the board. You only take cards from the center to replace the card you just used for your move. This way, there is strategy and competition involved instead of just pure chance. We also divide into teams when we play and partners have to communicate non-verbally to each other about the next move, and players can pass their turn to their partner if their hand is bad. This game gets pretty brutal the way we play it, especially because it is always at Christmas or Thanksgiving and everyone has been drinking a lot. It can also get confusing because on each turn, the player can propose to change or add new rules by a vote. Anyway, this is not how I played it in the dream, but I explained all of this to the Green Day trio. In the dream, we did divide into teams, but changed the rules so that partners can see each others' hands, since Billie, Mike, and Tré! didn't really know how to play yet. I was teamed up with Billie with the green pawn and Mike and Tré! were together and played as red. I of course was really good from having played so much and crafted lots of strategies, but Billie wasn't that great so it balanced out. Mike and Tré! were getting aggressive and offensive like my cousins and the rest of the family does, but I still managed to pull a win for Billie and me.