Looking for self improvement workbook + relationship books!

My partner and I are long-distance. We’ve been dating for 4 months now, and it’s been amazing. Every now and then, when I’m not feeling my best, I take a couple of days for myself and my partner. What that usually looks like is focusing on my own well-being and only speaking to my partner during those days. It helps me reconnect with myself and with us.

That time is coming around again, because I haven’t felt great for a few weeks now. My mind feels scattered and jumbled. I feel both close and far away from my partner at the same time—it’s a strange feeling. I’m dealing with generalized anxiety and just a lot overall.

I’ll be home alone for a week, so I’ll really have time to settle in, take care of myself, sit in some silence, and reconnect with my partner—not just by talking and spending time with them, but by reflecting and grounding myself in more positive thoughts about our relationship, introspecting, and etc.

With all that being said, my questions are: Do you have any recommendations for workbooks for self improvement/anxiety, journals, or favourite relationship (non-fiction) books?