1 month on Prozac (unbranded fluoxetine)

I've been taking 20mg for just over a month. It's been fabulous so far, I noticed a change from day 1, and my anxiety has been very little, and I've not been experiencing low mood that I can't get myself out of, or even a slightly funky mood. I've been able to just look past it I guess? In a way I've never been so naturally able to do without sitting down and talking to myself.

Only issues I've had have been sleep disturbances, the first week I really slept badly, but I've been taking Kalms and that's been helping a lot, and I feel things have rebalanced.

Sex drive is lower and that has been a bit disturbing I can't lie.

However apart from these things I've been way more energetic, felt so much happier and confident. No longer feeling like I'm hanging off the edge of a cliff where a slight breeze will blow me tumbling, but now like I'm sitting on a bench looking at the beautiful view, and if there is a breeze it just blows my hair not like it'll throw me to my death lol.

However today I've been feeling...weird. Like a bit low and like this low lying depressed feeling like pointless. Tinged with a bit of anxiety I think. My skin feels prickly like it does sometimes when I'm anxious.

Is this normal? To be feeling absolutely fine and then just randomly not? And can I expect this feeling to go away? Is this a cycle that might keep repeating?

Also, anyone else experienced a change in sex drive and has thet remained or improved?