Issues after installing update to OS17.05.2

I updated about two weeks ago, since then, I don’t recieve e-mails, I can’t swipe from top to bottom to go to flight modus, etc, I can’t change between apps using the sqare, I always have to use the back -button, it’s often hard to connect to wifi, I also can’t store my photos on my computer because the FP2 photo folder is empty. When I connect the USB I don’t get a message on the phone because I can’t swipe from top to bottom anymore, it only gives me " no new notifications")
I have taken the phone apart and put it together again. I’d like to get rid of the update, because it was certainly no improvement But I can’t do that either. Updater does not have this possibility.
Can anybody help me? I am no IT specialist, though.

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