Hi Heinz and welcome to the site. Well done on looking for help.
Read the other stories here, you will see a lot of things that you will relate to. You will aslo read the success stories – what are they doing that you can apply to your own situation?
As you have found, setting limits doesn’t really help and just keeps the addiction ticking over. Rather than have those limts why not ask them to ban you from the site? Better still have a blocker on yoru PC.
Keep this thread running so that you can track your progress in recovery. Let us know the positive steps you are going to be taking.