Updated PHP and now all WYZI options are gone and can't edit and add pages

I am not a developer and need help resolving this. My wordpress dashboard/menu is missing a lot of items including add/edit pages and all WYZI options and I can’t really do much on the site. My site initially went down after php update and blue host help me fix it and said woocommerce plugin was the issue and that has now been disabled. I reached out to bluehost again now and they told me to change the theme! I am not a developer but even I know if I change the theme, the site will break!
Any help here will be appreciated? Is this theme not compatible with the update?