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Try deactivating all of your plugins to explore whether any could be responsible. If none are, keep all plugins deactivated and switch to the Twenty Fifteen/ Fourteen theme to see whether it could an issue with your theme.

If you cannot access your dashboard, you can deactivate all of your plugins via FTP. FTP is just a name of the thing that lets you manage the files and folders of your website. This is not the WordPress dashboard, this is something that your hosting providers give you. It can just be a simple file manager that lets you edit files, upload new ones and rename folders.

To deactivate all of your plugins via FTP, you just need to rename the “plugins” folder (yes the “plugins” one). Then WordPress will automatically deactivate all of your plugins. You can rename the folder name straight back afterwards.

Your website should then be up and running.

If your website is still not up and running, you can try deactivating your theme. You need to make sure that one of the default WordPress themes, Twenty Fourteen, Twenty Fifteen or Twenty Sixteen is available in the “themes/” folder. Then find your active theme in the “themes/” folder and rename the folder of your active theme, e.g “spun” to “spun-old”. Then rename it straight back afterwards.

Then your site should at least be up and running with one of the default themes.

If still that doesn’t work, you can try replacing the core WordPress files. Pay attention to the bits in bold:
Try downloading WordPress again and delete then replace your copies of everything except the wp-config.php file and the /wp-content/ directory with fresh copies from the download. This will effectively replace all of your core files without damaging your content and settings. Some uploaders tend to be unreliable when overwriting files, so don’t forget to delete the original files before replacing them.

If you need urgent support then we generally forward you onto better support avenues like WP Jobs and CodePoet. It’s to prevent frustration that your issue has not been resolved in the time frame you wanted.
The WordPress.org forums aren’t a guaranteed way to receive support. This is mainly because the people providing support here do so out of their spare time and threads can go unresolved for weeks or months.