Website gone down for no reason I can work out

I had my site working for almost a year when suddenly I checked it and all the home page says is

Additional uncaught exception thrown while handling exception.

Original

PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: SELECT revision.vid AS vid, base.uid AS uid, revision.title AS title, revision.log AS log, revision.status AS status, revision.comment AS comment, revision.promote AS promote, revision.sticky AS sticky, base.nid AS nid, base.type AS type, base.language AS language, base.created AS created, base.changed AS changed, base.tnid AS tnid, base.translate AS translate, revision.timestamp AS revision_timestamp, revision.uid AS revision_uid FROM {node} base INNER JOIN {node_revision} revision ON revision.vid = base.vid WHERE (base.nid IN (:db_condition_placeholder_0, :db_condition_placeholder_1, :db_condition_placeholder_2, :db_condition_placeholder_3, :db_condition_placeholder_4, :db_condition_placeholder_5, :db_condition_placeholder_6, :db_condition_placeholder_7, :db_condition_placeholder_8, :db_condition_placeholder_9)) ; Array ( [:db_condition_placeholder_0] => 28 [:db_condition_placeholder_1] => 27 [:db_condition_placeholder_2] => 26 [:db_condition_placeholder_3] => 25 [:db_condition_placeholder_4] => 24 [:db_condition_placeholder_5] => 23 [:db_condition_placeholder_6] => 22 [:db_condition_placeholder_7] => 21 [:db_condition_placeholder_8] => 20 [:db_condition_placeholder_9] => 19 ) in dblog_watchdog() (line 160 of /home/soncal5/public_html/taekwondobrightonhove.co.uk/modules/dblog/dblog.module).

Additional

PDOException: SQLSTATE[HY000]: General error: 2006 MySQL server has gone away: SELECT ff.* FROM {filter_format} ff WHERE (status = :db_condition_placeholder_0) ORDER BY weight ASC; Array ( [:db_condition_placeholder_0] => 1 ) in filter_formats() (line 427 of /home/soncal5/public_html/taekwondobrightonhove.co.uk/modules/filter/filter.module).