Neutered My Noggin

Previously unhinged like Shane in The Shield
Had no choice other than to finally yield
Roaming with a neutered noggin
But acting great like Walton Goggins
Glad I could get back to enjoying things
Like holding the rings at my brother's wedding
The drugs don't work
This isn't a song from The Verve
All emotions were in reverse
Initially I had a good nurse
How do you test for a chemical imbalance?
When no brain scan given to show the actual damage?