How long will it take for my body to back to normal after Nexplanon removal?

I had nexplanon for 6 years. Gave me the worst side effects. Almost immediately I felt better. I felt like a huge weight had been lifted.

Everyone is different. It's honestly impossible to say.

If you have problems coming off it, my advice would be to do what I had to do after the contraceptive injection left my hormones a real mess, & look into Vitex. I won't give you the whole story, but I was in a bad way. The doctors tried all sorts & were considering a hysterectomy.
Eventually I researched & found out about that, which is natural, & balances your hormones gently.

You can't use it if you're using any hormonal birth control, because they'd work against each other, with the birth control deliberately creating an imbalance of the hormones, to stop you getting pregnant, & the vitex balancing them again. In other words you could end up pregnant.

Once you're not relying on hormonal birth control, though, you'll be fine to use it.

Once your hornones are balanced, you should see any hormone-related weight start to fall off.
If you need to use it, you'll probably need to give it at least a few months trial. I saw effects really fast with it, in that, it stopped the constant bleeding & eased the mood swings, but things improved further as I stayed on it longer.

I also recommend taking oil of evening primrose, & vitamin b6, along with it, if mood is an issue for you. The combination of the 3 has worked wonders in that department, for me.