I felt this a lot! SO frustrating, oh my goodness lol. I don’t miss that feeling at all. But you will get there. Time does pass. Sometimes when out my window it looks like I’m crawling at a snail pace, it can help to glance in the rear view mirror. Not to dwell on the past by any means, but to show myself that progress is happening, even if things appear stagnant while I am in the midst of it.
Sounds like the working out is great up until a certain point. I think it might just take some trial and error until you figure out where it feels best to stop, and how much is too much.
There’s a fitness thread you might find helpful: Gym selfies, weightlifting & fitness 🔥 (TW gym attire. Keep rules #6 and #7 in mind) (Part 1) It’s a good place to find motivation, ask questions, share your ups and downs, selfies or not.