My Weakness

Here is my weakness as a mom (and as a person) that I need to work on:
when I have a recurring problem with someone/something I have a really hard time beginning to face the problem with a fresh attitude each time it begins anew. For instance lets say one of my children has struggled in math for Y E A R S. I have been making up practice work for specific skills, drilling math facts, paying for tutoring, trying to let him handle the problem, finding workbooks, checking extra work... and on and on and on. And it seems like things get under control only to have grades drop 3 weeks later or as soon as the skill set changes to something different. And instead of starting fresh with "how are we going to work on this?" I tumble immediately into "Didn't we just spend hours and hours getting you caught up? Why are we back in the same place?" At points I have given up the battle and handed it over to D and that helps a bit, but I just can't seem to stop from feeling like I am ramming my head into the same wall over and over. It's not just the math thing either. With other kids it has been sleep issues or potty training or other things. It just hit me again today as the fourth year of battling with math is beginning and I am not sure I have the energy to put into it. I know I have to, but right now it looks like a daunting task. I need to find a way to attack recurring problems with a fresh outlook. Any advice?
love and hugs, B