Firstly you need to stop taking stuff with ibuprofen, that is doing considerably more damage than the codeine, codeine relatively non toxic but stick some ibuprofen in the mix and it’s a recipe for gastric problems in the amounts you are taking.
There are lots of people on this site who are currently going through withdrawals. I’m tapering myself although it’s not going to plan. You really need to cut the amount you are taking ASAP though, I cannot stress this enough. Most on here have better luck CT, myself, I’m tapering until OCT 15, I’ve then booked two weeks off work to CT. can you do something similar?