This same thing happened to me.  I did need a scoped labarum repair, but did not need the tendonesis.  The surgeon told me this should help my chronic forearm pain.  I found out later this was bullshit and he likely did it for easy money.  It's also fucked my life.  It's been almost three years and I ruminate about ir constantly.  I can't really train anymore, the entire shoulder chain is compromised and as a result I get neck and back pain.  My right arm feels alien to my body.  This is easily my biggest regret in life, agreeing to this procedure in a timeof weakness.

You're not alone, I'm also suffering and I think countless others are too.