Feeling bad again after feeling really good?

On 40mg at week 5 i had a dip that lasted a couple days and when it was gone I bounced back to nearly 100% me. I was so close to full remission and suddenly on week 9 I took a huge dip again and it's been 4 days of this. Anxiety and sleep troubles back again.

does this happen and you still straighten out? Or does this mean I need more than 40? Is regression at 9 weeks still somewhat normal? Do I just wait this out?