Anyone else ever feel like their meds work inconsistently?

Nothing to do with the manufacture either as I experience this with the same script lol some days it works great all day, other days I feel like I’m crashing at noon.. other days I’m more anxious, sometimes I just feel blah/like I’m unmedicated…

I will say I have more good days than bad! But it’s so weird to me as I keep the same routine everyday.. once I realized what my body seemed to need for it to work it’s best I’ve stuck to it.. no caffeine, lots of water, eating before taking it and enough during the day, avoid vitamin C etc .. none of that changes so wtf? Lol. I get the same amount of sleep most nights (I wake up often through out the night but that’s never changed as I might have sleep apnea)

Anyone else feel this way?