I could really use some help and advice. Namechanged as other posts might out me.
Been with DH a LONG time - over 20 years. Four kids. We've had our challenges (bereavements, extended family issues, financial issues) but our relationship has always weathered these - or they have until now.
The past couple of years have been particularly difficult for DH professionally. He's made mistakes and choices that have been really misguided, ones that have negatively affected not just our family income and lifestyle, but also how he behaves - when he is stressed he has a horrible temper and gets very grumpy etc.
He is taking steps to improve things, but increasingly I just feel like I am done, and I've never felt like this before. It seems I can't forgive some of the mistakes he's made and how he takes his stress out on me and the kids and feel massively resentful. Because I recognise part of how I'm feeling might be due to circumstances or how I'm handling things myself, I want to set myself a mental deadline to see where we are in, I don't know - three months? Six months? - with the mindset that if I am STILL feeling unhappy by that date, it might seriously be time to consider if our marriage can continue. It breaks my heart to type that. 
Anyway - sorry this is long. Has anyone ever set a similar deadline, and what helped you? I veer between trying to brush everything under the carpet and function as normal and simply feeling like I'll never get past this.