This is such a hard situation when you have chronic pain. And you have young kids! I'm a mom too and it is very active and busy. You want to be your best self for the kids, I totally get it! I'm right there with you.
So, you have to get through the withdrawals first. And once you do that, it will get better. So, be kind to yourself for this next bit.
The medication they prescribed you though shouldn't cause too much withdrawal as it is also an opiate. It is Suboxone (however, suboxone has an additional med added to it that blocks the affect of opiates). Have you heard of that? This is often given to people who are addicted and want to get 'clean' and also for those with a chronic moderate pain condition. That sounds like you, right? This could be a good thing if you are able to make the switch and the just maintain with the suboxone! It's an alternative. It will not cause the euphoric feeling so you will perhaps function even better with your daughters! I know you probably didn't really have that feeling much anymore any way. But this just works on the pain.
I'd try to make the change and see how it goes. Let me know how you are doing!! hugs