How should I handle this?

Mara • 19. Canadian. Not trying to conceive at this time.
My SO gets random anxiety attacks that are so unpredictable. I personally cannot relate to him because I don't have anxiety issues. I wish I could help him and I always want to hold him close when he's going through one and reassure him but he just goes for his meds and pushes me away. Is that common or normal? How do I help him? I'm afraid if I leave him alone he will think I don't care. Does anyone else suffer from anxiety attacks or have an SO that does? Any advice would be greatly appreciated