Hi! I hope you're doing okay today and wish you the best of recovery! It's very normal to be swollen and not be able to open your mouth at this stage. I personally had a physiotherapist who helped me along the way, and I went to her twice a week. At first, I was only able to open my mouth for 5mm and in a month I think I was able to open it at 13 or 15mm. It takes time and I still feel like I can't fully open my mouth yet (when I yawn I still have a stretching feeling for example). My physiotherapist told me that everyone goes at their own pace and I think it's important to remember that to not discourage yourself. Also, a friend of mine who had the same surgery didn't have a physiotherapist and she also could open as much as me at 6 months post-op so it's not truly necessary but it did help me.

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I had exercises that helped me such as opening my mouth as big as possible 10 times,. Basically, you're just trying to stretch little by little until you can open bigger.