Months three and four were mostly good for me. Month five I struggled a lot. No reason for it, either. Well, no external reason. 7,8,9, fine for the most part. I was working through some interpersonal things, but no huge deficits.
At month 10ish I suddenly felt "well." It was so nice.
Keep working, keep thinking about how you can support your sobriety. It took way longer than I was happy about, too.
Healthy meals, a little exercise, easy on the caffeine and sugar helps a lot too.
Other thing is just - people have "off" days. Everyone does.