Your nerves have been squashed and moved around and are not happy!
Months of pre op pain does not disappear with the knife.
The relief you feel instantly is great but you are full of anaesthetic. It takes upto 6 weeks for it to leave your body completely.
It is going to remain painful for some time but please do not give up. Physio is painful! You will need your meds. You need to come off Lyrica very very slowly. This could be affecting your mood if you are dropping quickly.