I was given liquid ibuprofen post op by the hospital and wasn't given any warnings. Found the paracetamol worked better but would occasionally use it as a top up in the first couple of weeks. Used to take it anyway occasionally if needed for my knees, although the diarrhoea could be a problem if taken for too long. Have taken it again this week for my sinuses. No other side effects.
Mazza, I currently take 20mg of omeprazole daily (acid reflux being a known side effect of the sleeve). After my recent arm surgery, where I was prescribed strong ibrupofen and have also been taking one codeine at night, I was told to double my dose of omeprazole to protect the stomach. So ibrupofen is entirely safe, but your stomach is still swollen and inflamed so might be wise to protect it further.
I asked because I get bad period pain and really missed my ibuprofen last month! I was told by my consultant as long as I was taking my lansaprozole and it was for short bursts at a time then he would be happy with that. So I wouldn't worry too much - you might just need to increase your omeprazol