Unable to login

I am unable to login onto my WordPress admin panel. It was working fine yesterday and all of a sudden it stopped working. There is nothing that I have done in my right sense to cause this error.

I turned WP_DEBUG to true in wp-config and got these error when I tried to login.

Notice: register_sidebar_widget is deprecated since version 2.8! Use wp_register_sidebar_widget() instead. in /hermes/waloraweb084/b294/moo.mythemecom1/wp-includes/functions.php on line 2824

Warning: session_start() [function.session-start]: Cannot send session cache limiter - headers already sent (output started at /hermes/waloraweb084/b294/moo.mythemecom1/wp-includes/functions.php:2824) in /hermes/waloraweb084/b294/moo.mythemecom1/wp-content/plugins/woocommerce/woocommerce.php on line 79

Notice: register_sidebar_widget is deprecated since version 2.8! Use wp_register_sidebar_widget() instead. in /hermes/waloraweb084/b294/moo.mythemecom1/wp-includes/functions.php on line 2824

Notice: register_widget_control is deprecated since version 2.8! Use wp_register_widget_control() instead. in /hermes/waloraweb084/b294/moo.mythemecom1/wp-includes/functions.php on line 2824

Notice: Undefined offset: 1 in /hermes/waloraweb084/b294/moo.mythemecom1/wp-includes/class-wp-admin-bar.php on line 38

Notice: has_cap was called with an argument that is deprecated since version 2.0! Usage of user levels by plugins and themes is deprecated. Use roles and capabilities instead. in /hermes/waloraweb084/b294/moo.mythemecom1/wp-includes/functions.php on line 2908

Notice: has_cap was called with an argument that is deprecated since version 2.0! Usage of user levels by plugins and themes is deprecated. Use roles and capabilities instead. in /hermes/waloraweb084/b294/moo.mythemecom1/wp-includes/functions.php on line 2908

Notice: Undefined index: page in /hermes/waloraweb084/b294/moo.mythemecom1/wp-content/themes/mytheme/functions/theme_options.php on line 48

You do not have sufficient permissions to access this page.

What do you guys suggest I do next to troubleshoot?

Thanks!