That does sound great! My partner understands better than most but not completely, so we still have the occasional miscommunication.
I feel that second part. My confidence is higher than it's ever been. For months I've been scared I will lose it, but I realized that if it got there once, it can again. Don't lose heart. You know you are capable of feeling it. It's hard to literally reverse your thinking. You didn't raise your confidence, it's just lower than normal right now. Your baseline shouldn't be where you are now, but where you want it to be.
I think the trick I have used is, if it's confidence in a specific thing, try to step back from that thing and do something you know for sure you can. Take baking for example. Say you have gotten good at baking bread but you mess one up. Confidence lost. Step back, bake a pie instead. Then a cake. Then tackle the bread again. Hopefully you get the idea.