Aerosmith guitarist Joe Perry was hospitalized earlier this week after collapsing onstage during a show with Hollywood Vampires, his side-project with Alice Cooper and Johnny Depp, and Steven Tyler is very worried about him. Although a statement from Perry’s publicist promises that he’ll “rejoin his fellow Vampires on stage again soon,” Tyler has tried calling Perry several times but hasn’t heard back.

“It’s starting to scare me a little bit,” he tells Billboard in a new interview. “I know they’re putting out nothing but ‘he’s recovering, he’s really good, he fainted, exhaustion.’ But I know my brother. He’s just about the only other guy that’s as passionate about his art as I am. He’s always asking me to do three, four [Aerosmith] shows in a row, and I can’t. I’ll blow my voice out. I know how to maintain my career, my health, and Joe’s passionate. I don’t think he knows how to. I think he’s out there and someone’s overbooking him. They’re doing like eight or nine shows in a row, or five in a row. I think they’re all a little burnt. I think they may need to look at that. Not young anymore, y’know?”

Will Perry be able to tour South America with Aerosmith in the fall, or participate in what Tyler says will be the band’s farewell tour next year? “I don’t give a shit about the band. I want Joe to live,” Tyler says. “I’m really concerned and worried right now that I’m not getting any news. I’m a little bummed out, and that scares me. I don’t know whether it’s heat prostration or whether he’s been working himself too hard or getting off on wrong things passionately. I don’t know what it is, but I know that nobody’s talking to me. I can only tell you that Joe’s my brother and I love him so much.”?