I also had this back in January after a cataract operation last year. I went for a routine check up & the consultant was very alarmed to see some retinal tearing & called a colleague to see if he had time to see me the next day for laser repair of the tearing. I wasn't too worried at this point as I knew it was a minor procedure but when I was examined the next day it was found I had a detachment, not just tearing. Fortunately the theatre staff stayed on over lunch & I was added to the end of the morning theatre list.
Unlike you it was done under local anaethestic which is a fairly uncomfortable procedure involving a needle through the eye to the rear of the eyeball. Once everything was numbed up it's just pressure on the eye area though so quite bearable.
You'll find it will take some weeks for the gas bubble to be absorbed - mine went six weeks to the day. Things get better once the bubble is down to about half of your visual field as you can see with both eyes again but I found that until that point it was better to wear an eye patch to reduce the confusing images presented to the brain. One oddity is that although the bubble is at the top of your eye it affects the bottom half of your vision. You cannot fly or have nitrous anaethestic for three months (although I was let free when the bubble went). Over here they put a yellow wrist band on you in case you are in an accident.
The most inconvenient aspect of the whole procedure is if you have been given instructions to "posture"; I had to lie on my right side to keep the bubble against the tear. I had to stay like this for five days, only being allowed 10 minutes vertical in every hour. I considered myself very lucky as some patients have to lie face down which would be very difficult. I found that there are specialist posture chairs that you can hire for a couple of weeks; I don't know if you have the same in Holland if you need one.
The good news is that my sight has returned to as good as it was before so although it's a difficult time there is hope that there won't be any long term effects. The key this is that you were treated before the critical part of the retina was involved.