Is a drastic change in emotions okay?

Hello! I'd like some advice on whether or not such a big change in emotions (from really low to really positive) is anything to be concerned about. I know it sounds like a silly thing, so I'll give some background. Trigger warning just for mentions of suicide, just to show the contrast.

I made a post on November 20th about being in a really low place and how I took the first step to get out of it. In fact, I've been struggling with really low mental health this month. It was to the point that I was writing notes almost weekly. I won't get into little details on everything, but I did have a set plan to to do it. I tried to about 2 1/2 weeks ago and I planned to try again (fortunately I was so exhausted by the end of the day that I quite literally didn't have the energy to do so). I cried almost every day last week and I remember crying on Sunday from just being so mentally exhausted from life.

On Monday, I felt better and I felt like I was making progress. And today (Tuesday), I feel drastically better. I feel energized and alert. I feel motivated to work on all my school stuff. I feel like I can hang out with friends and joke and just be fun to hang around. Don't get me wrong, I'm incredibly grateful for feeling happy and energized, especially since I do have to get through finals next week. But it just seems a little strange? I'm not upset or anything at all, I'm just wondering if this is normal. I've had similar moments before where I was really down for a week or two and then I feel "normal". This is just the biggest difference I've seen yet. I hadn't been that low in awhile and I haven't felt this high (not literally lol) in awhile either.

Sorry if this is a lot, I just don't know where to ask this elsewhere. Should I expect to crash again? Is this just my mind's way of balancing things out? Any thoughts at all are greatly appreciated. Thank you!