As someone who has gone through it, do your utmost to fix yourself and overcome your michsholim. Encourage your spouse to do the same for him or herself. If you or your spouse can be helped by a rov or a professional to do so, great. Know one thing. You can only change yourself. You can’t change your spouse, and they can’t change you. If he or she isn’t able or willing to change, or you aren’t able or willing to change, together, it isn’t going to work. So at the end of the day, if you have made an honest effort, if it still doesn’t work, it is time to end the marriage.
It is 100x better to end a poisonous situation that isn’t improving than to stay together and let the wounds fester. Your children will not be helped by an increasingly acrimonious atmosphere in your household. Neither will you or your spouse.
Also know that if you are not happy – or if you are walking around disappointed, angry, despondent, depressed, or out of sorts, your children will pick up on it immediately. Your parenting will suffer. So this “sacrificing your happiness” for them sounds noble but is really negative. You want to sacrifice material things for them, fine, good. You want to sacrifice time for them, even better. But If you aren’t happy, they will be affected.