Hi Marek,
Well done on looking for help. You are not alone with this problem. Read the other stories here; you will read a lot that you will relate to. You will also see the success stories and the sorts of things that are helping others stop gambling. You can apply them to your own situation.
You are gambling online, get yourself excluded from your usual sites. Then you can install a blocker on your devices which will stop you signing up at others. Here is a link to details of a few blockers. https://www.gamblingtherapy.org/information/how-do-i-block-gambling-sites/
You wife could help with one of the otehr barriers you will read about – limit your easy access to funds so that you can’t gamble instantly on an urge.
There is a lot of support around these days – this link might help find a Gamblers Anonymous meeting close to you; just click on your country. https://www.gamblersanonymous.org/ga/addresses?page=1
Keep posting and let us know the positive steps that you are taking.