Remove Sidebar Items for All Blog Categories?

Hi,
I am using my website blog area to post anatomy information and it has required me to crete several hundred blog subcategories, which I have done successfully. However, now when I go to Appearance>Widgets, it takes several minutes to load because there are several hundred new sidebar items created based on every single blog subcategories. 
I want to delete all sidebar items based on blog subcategories that are at appearance>widgets. There are too many to do one at a time. I am not able to do it via appearanve>customize because that crashes with the error:

Fatal error: Allowed memory size of 67108864 bytes exhausted (tried to allocate 42 bytes) in /home/thejamesb/public_html/wp-includes/class-wp-customize-widgets.php on line 391

Can you tell me how to get rid of all those sidebar items that I don't need? 



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