I am so sorry to read this. Many people like me joined the forum because of behaviour issues.
My immediate reaction is puzzlement at this starting 11 months, so maybe a check up at the vet, and if all well, a meeting with a behaviourist.
I think you may have difficulty with rehoming a dog that has bitten, you have to be open with rescue charities, and obviously doing it privately is a no-no.
You need to work with an experienced trainer to watch and assess the flash points where your otherwise loveable pet gets reactive.
My beloved Bobby was hand shy, crate shy, car shy, chronic guarder etc. He started at 12 weeks. We had to be very patient and inventive to control the known triggers to his panic attacks. Initially we would leave the room, and within a minute he would want us, tail wagging. Special food treats were needed to divert him in other situations. I changed to a slip lead, to drop over his head, a thick soft one(actually a horse leading rein).
I can go on and on, but I’m sure others have advice. Bobby was always weird, but he couldn’t help it, but improved a lot. We don’t know what has caused the change in your teenager pooch, so start at the beginning, reduce stress levels all round, don’t have face-offs with him because it aggravates the situation. Their Adrenalin levels can take a day to go down!