Fixing a relationship is much harder than maintaining a healthy relationship. First ask yourself - how willing am I to struggle through the "suckage" to get healthy with my partner again. It is ok to not be 100% because of fear of something unhealthy in your relationship, but then you have to ask yourself how important that thing is to you. ... will you be safe? will you be able to stay calm in the struggle? will your mental health survive?
Then ask yourself have you ever talked to your partner about the problem. There is always an elephant in the room that we dance around. You may be having arguments, but the way you argue may be the elephant in the room - or may be the reason why you can't talk about the elephant in the room because you keep arguing about the same thing you feel you can argue about in some way to avoid the thing that is really upsetting you or feel like you can't talk about for some reason.
Next only use I statements. If you start a sentence with You - stop right there. Whatever comes after that is going to sound accusatory and upset your partner. I statements go something like this .... "I feel --- when ---- so I would like if ----- when -----" There are many varieties of I statements, but you have to change the way you say things so that you are heard by others so that things can change.
Don't see a therapist without your partner. This is cheating them out of hearing it from you, and they will feel ganged up on if you start saying things like "my therapist says"....
All partners disagree. We all have things that we were raised differently concerning. It is ok to disagree on things. It is not ok to let those disagreements run your relationship.
It is also ok to decide it is not worth it at this time and take a break. Stepping back sometimes help you see the larger picture and helps you make better choices. Staring at a tree for so long because it is different, eventually consumes you and you forget there there is whole forest around you.
Anytime you look at something in a magnifying glass, you see its imperfections.
I hope this helps.
:) Susie

Susie offered some great advice. The only thing I'd say about the therapist, is that if your partner is unwilling to go, I think its OK for you to still go if its helpful for you. Susie is right about the "my therapist says" though, so you may need to think through how those conversations will go.

I've also found that sometimes its helpful to have a day just for you - you can always come back to the relationship, but alone time is just as important as together time.

Have you tried spending some time apart ?