Langley's fight

I am trying my best these days to remember the Langley who was first with us, the goofy smiling boy who loved rolling in the grass, belly rubs, rattie runs, and always seemed to have a grin on his face.
Over the last month and then dramatically so these last few days, Langley has descended into an obsessive-compulsive hell to the point that he is no longer able to function.  His compulsion is to hunt outside (and now in). When off leash he can focus on nothing but pacing and sniffing, frantic to find what he's searching for.  To control this I try to keep him on leash at all times but now all he does is lunge for the area of the yard where he knows the birds like.  He struggles and becomes so overworked outside that he can't disengage at all, even enough to go to the bathroom.
When inside he can't be off leash because he will repeatedly lunge at the sliding glass door to get outside.  All windows in our house are kept covered to try to not get him additionally worked up and music is playing at all times to cover any sounds of birds outside.

In the last couple of days he can't even be on leash. The only thing that seems to give him rest from the anxiety is to be held and bounced.  For hours we bounce around the house, me trying to relearn how to do everything one handed like I was an expert at when my son was an infant. Doing this with a squirming 18# dog in your arms is not easy though.

We have tried both natural things and medicines.  Thundershirts and swaddling, classical music, DAP diffuser next to the crate, Xanax and Valium and Prozac is now being started.  Ace-promezine had to be added so he wouldn't injure himself when crated and I was out of the room.  The meds don't seem to touch the anxiety, and even the Ace, meant to slow down his physical frenzy (Ace does nothing for anxiety so don't let your vet tell you it's a treatment for an anxious dog) only works minimally.

This is the heartbreaking side of rescue: when you do everything you can, give your all to make a dog feel better and your all just isn't enough to stop the suffering.  All we can do now is send healing thoughts to Langley and hope that the fluoxetine (Prozac) ramps up in his system quickly and makes a difference for him.