Aaah, sweet Zinnia...I understand your worries and concerns, you've had some unfavorable experiences.
All you can do is pick yourself up, dust yourself off and start all over again....just like the song.
You're learning something through each of these experiences. First you learned you don't need aggressive PT.
This time you're learning you may need to fit in more rest in the beginning for maximum effect later.
Possibly the diet piece is new for you. Incorporating protein for optimum healing. Let's have faith that with all you've learned and are applying...healing will happen. You mentioned tiring easily. Good! Make sure you don't ignore that. Our body does it's best healing while we're sleeping. So sleep whenever you're able.
You're tired because your body IS healing. Our body's energy supply isn't limitless. So when we're in healing mode after major surgery our energy will be used for healing first, not leaving a great reserve for all the other activity of daily life. It is completely normal to feel tired for quite some time. How long....most likely relates to your body's rate of healing. Making our best effort to get adequate sleep and rest is beneficial. So enjoy naps. They're doing your body good!
Look at that "new" daffodil as your "new" beginning. It's not going to happen overnight. Patience dear, Zinnia. With patience, perseverance, encouragement and love you'll get there. We're here, I'm here. I think you know by now your stuck with me, lol! Prayers this is a good day!
Big love and hugs!

@zinnia