My cofounder drives me crazy. Please help

I’m one of two cofounders and we have equal ownership in the company. They are the CEO and I am CPO/CTO. I built our entire saas product that got us to pre seed funding. And 85% of our funding came from my network. I feel like I’m carrying the startup in terms of total work and overall output. And my cofounder fights me on things and I honestly can’t stand working with them. I’m clinically unhappy and it’s mostly because of the tenuous relationship I have with my cofounder. I can tolerate stress from work but I cannot tolerate having to argue about inane shit that doesn’t matter. I have tried to talk with them and try different things but they legit say things that just piss me off constantly. If I could detach I could maybe get by but I care too much. I simply cannot walk away right now either because if we do well in this next year we will be set up for acquisition. If I leave I have high doubts that we can find a way to hire and deliver the product in the narrow window we have. Anyone have tips for me? Therapist? Anything? I just hate working with this person and it’s such a fucking drag. Which sucks because I really don’t want to work on this startup anymore because of it. Thanks