40mg to 30mg after a couple weeks

As the title says, I'm going back down to 30mg from 40 in hopes that the 40mg side effects was just too much for me to handle.

Within a couple days of taking the 40mg I was dizzy and I tried to ride it out for about 3 weeks. I didn't have any of the other side effects when I went up to 30. (Sleepy all day, yawning, absolutely exhausted, nausea...) Well I decided couldn't't handle it most days so I'm switching back to 30 where everything was baseline for me. But as of this morning, I feel worse. Am I right in thinking it's my brain adjusting to the lower dose again?

The only reason I went up was because I was having a lot of emotional things happening in my life and it had been a long time coming. Crying a lot of the days, thinking I'm the most horrible person to exist, that I don't deserve anything nice...etc. I was/am going through a breakup after a long term relationship. My ex said some pretty mean things about me that made me not want to be here anymore.