My breathing is concerning me.

[Jgirl2001]

I'm a young teenager and I was over dosed with morphine after a surgery on my ankle. And ever since then I've had a problem with my breathing. I'll be doing something normal and I'll go to take a deep breath and a sudden pain sharply darts the middle of my back more to the upper part.
This only started happening after my over dose.
As well as my breathing suddenly gets shallow easily. Like I'll stand up and start walking around the house and I will get dizzy and my breath will get really short. I've been to a docter and he said the dizziness is just a female hormone. And my breathing was probably caused by the morphine over doseveral concidering I was put on oxygen until I woke up.. I don't know what to do anymore. .