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Settings unfortunately stops working, unable to reset my phone
What if you remove the SIM and SD cards > boot in >>> safe mode > check again.
"I'd rather be hated for who I am, than loved for who I am not." Kurt Cobain (1967-1994)
I'm sorry to hear this. You can try to reboot your device to safe mode as @uliwooly suggested to see if there is one of you downloaded apps that is causing this behavior as these will be temporarily disabled in this mode.
If there is not change in safe mode or when you remove your SD and SIM card I recommend that you perform a software repair using Xperia Companion.
Let us know how it goes.
Official Sony Xperia Support Staff
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