Hello @JillsRecovering and welcome to our little family -
We are so pleased that you have joined us, and we are here to support you throughout your recovery. My apologies for the delay, I have been off doing a bit of life maintenance in the past day, but getting back to you was 100% on my list. You are that important to us!
As @Moltroub has so kindly eluded, I also ruptured, and throughout my recovery, it was strongly stressed to me the importance of mindfulness/meditation to help in reducing stress. Doing mindfulness/meditation often includes breathing exercises, and (coming from a Western scientific mindset), my wearables do show how much it helps to calm me down. I have even heard anecdotally that Navy SEALS use one method when entering stressful situations, so if it is good enough for them, it certainly is good enough for me! 
That one in particular is called Box Breathing, and I love it because it is so simple, I can actually remember it in stressful situations. I am enclosing the below video, as it is quick and effective for me, as well as placing you in a serene environment. Repeat as often as needed!
… and maybe because there is something in the air today, but a friend and I were just speaking about another meditation practice this morning on my daily walk, which you may also find helpful to calm the nerves. Depending on the age of your kids, this might be something that they can practice with you too, as it is very kid-friendly, as you end up humming like a bee, and what kid (or child-like adult!) doesn’t want to do that!
Besides breathing exercises, there are a ton of apps out there offering up various meditation/mindfulness practices. My personal favorite is Healthy Minds, as it is an East-Meets-West app, and it mixes both science about our brains with meditation practices. My wearables also provide me with some access to other meditation sources (Calm.com and Fitbit), so I do alternate those in as well just for variety.
Additionally, just last week I learned about yet another source Love Your Brain that has a free registration to access a library of mindfulness programs. I confess I haven’t checked any of them out yet, but part of the appeal to me is that Love Your Brain is specific for people who have had a brain injury, so it’s like they get us! (Note, they do talk mostly to TBI (traumatic brain injury) folks, whereas we have acquired brain injuries, but to be fair, they are a much larger population than we are.)
Finally, what I see and hear is that you are ALREADY the mom your kids deserve. You are here because of the depth of your love and concern for them, so that tells me what a wonderful mother you are! But, also remember that you have been through A LOT since May: you have had a major surgery (involving your brain!), and that is no small thing! I poked around and found this article that discusses post-surgical fatigue that may be of some interest:
Coping With Fatigue After Surgery: How to Identify What Is Normal and What Is Not
Our friends across the Pond (thank you!) also have a great guide on Fatigue After Brain Injury, and I really appreciate that it talks about how to learn about identifying triggers, and how to manage your fatigue.
So, remember in all this to be kind to yourself. Give yourself the grace to recover and heal. You are doing a great job, and we will be here for you, so please ask, chat, vent as YOU need!
Fin Whale Fan 