Well mania would, by definition, cause problems for you. If it doesn't have negative impact, it wouldn't be a pathology. Diagnosing involves considering symptoms and determining how many would apply toward a dx and the level of negative impact they have on one's life and functioning.

You describe a feeling of having an increasing sense of what you want and gaining energy from it. That's cool and would be naturally exciting. Maybe it's mania, but maybe it's just feeling driven by feeling a sense of purpose. That WOULD be exciting, especially having come out of a fight with depression.

It really would be something a professional would be needed to sort through. I know you know we can't diagnose and are just asking for opinions, but I have to say it's particularly obscured by normally energizing factors. And no mention of a pattern repeating over time in larger swaths of time. Or causing problems.

So, sorry to give a pretty predictable answer, but this seems particularly hard situation to even guess. If it worries you (or those around you are expressing concern), by all means, seek professional consultation.