Is there any counter argument?

I read the note. You’re clearly in a lot of pain. I’m not really going to argue against it, just raise a few points to consider.
The first being; are you confident you’ve explored any potential help that might be open to you? For some depression does just lift on it’s own in time, but I think for those with more complex issues relief only comes when they do something different. For that it’s helpful to understand the source of your pain. Have you tried talking it through with an empathetic professional? Have you tried medication (or perspective altering non-prescription drugs)? Are there significant things about your living situation that could be improved? What seems meaningful to you (if anything), and is anything standing in the way of that?
Only you can judge the extent of your pain, and how it might weigh against the pain of those you leave behind. But to do so I think you first need to have a good understanding of yourself and the cause of your suffering, as well as any alternative options.
One more question; you seem to believe that death will ‘set you free’. Supposing conscious experience did continue, what makes you think it would be any different – that your psychological pain wouldn’t simply follow you beyond? Surely that would be losing your wager, rather than oblivion – to be trapped with your pain, but no longer capable of change. That’s what I’d be afraid of.