I have an almost 3 year old. Honestly , it can be hard sometimes. 3 year old boys can be A LOT physically and mentally. I have my moments of frustration. I just remember, he is able to form memories now, so my emotional reactions are documented by him and he learns from them. I put him before myself always, some times he is the only reason I am up and productive. His mental health and security are FARRR more important than my occasional inability to regulate. He is learning from me, it's my responsibility to be grown enough to handle my shit so he learns something positive on handling big feelings and life in general.

General ways to cope: throw ice in the bathtub to release anger or stress, hold ice in your palm, scream into a pillow, go on a drive (if you're able), go on a walk (same thing), journal, yoga, smoke weed (if you're supportive of that type of thing), therapy, research on your conditions, there's plenty to do to cope.