What do I do about him?

So I haven’t gotten my period (20 days late) because I’ve started a new birth control. My depression and anxiety have skyrocketed in recent months and all of my issues and the extra stress from my relationship is taking an even worse toll on my mental health. I’m at the worst place I can be currently and instead of my s/o being supportive and helping me through my extremely thought times, he’s caused more issues than necessary. He’s changed a lot in recent months. The two years I’ve been with him, I’ve noticed he’s just gotten so irritable and distant and so cold. And I can never tell what’s up with him. i love him, I would do anything for him he is my whole world. But I fear it’s going to be an extremely toxic relationship and i have no clue how we can work this out. Any tips on what I could do?