The herbs website is
https://www.mskcc.org/cancer-care/diagnosis-treatment/symptom-management/integrative-medicine/herbs/searchIt's excellent and was first recommended to me by my oncologist.
It's a weird time eh, after active treatment. A lot of people struggle mentally, myself included.
I heartily agree with @Sister about finding an exercise physiology programme to do. You can ask your GP, oncologist, breast care nurse or your local public hospital.
It can be a good time to join a support group, and maybe see a counsellor if you're feeling a bit down or lost. It takes a while to process what's happened. You've been in fight mode. Now it's wound licking time!
It can be a good stage in which to start a hobby, or renew an old one. There's also lots of fundraising activities out there, and not just for breast cancer. It feels good to give back.
Don't rush yourself, listen to your mind and body, and be kind to you. K xox