Error saving an edit to a Wiki page

I've gotten a number of different errors while trying to save a Wiki page the last hour. (It was working fine before that.)

It gave me a polite message that it was not saved, try again while staying in the Edit Wiki page.

It gave me one of those catastrophic (ha) Cloud errors. 504 I think.

And a few times it's given me this message that follows. I'll be leaving the page unsaved, and try a reload tomorrow.

Sorry! This site is experiencing technical difficulties.
Try waiting a few minutes and reloading.

(Cannot access the database: Cannot access the database: Too many connections (wiki.cwh621jgfadf.us-east-1.rds.amazonaws.com))

Backtrace:

#0 /var/www/html/includes/libs/rdbms/loadbalancer/LoadBalancer.php(995): WikimediaRdbmsDatabase->reportConnectionError('Unknown error (...')
#1 /var/www/html/includes/libs/rdbms/loadbalancer/LoadBalancer.php(666): WikimediaRdbmsLoadBalancer->reportConnectionError()
#2 /var/www/html/includes/GlobalFunctions.php(3062): WikimediaRdbmsLoadBalancer->getConnection(-1, Array, false)
#3 /var/www/html/includes/user/User.php(498): wfGetDB(-1)
#4 /var/www/html/includes/libs/objectcache/WANObjectCache.php(889): User->{closure}(false, 3600, Array, NULL)
#5 internal function: WANObjectCache->{closure}(false, 3600, Array, NULL)
#6 /var/www/html/includes/libs/objectcache/WANObjectCache.php(1009): call_user_func_array(Object(Closure), Array)
#7 /var/www/html/includes/libs/objectcache/WANObjectCache.php(895): WANObjectCache->doGetWithSetCallback('global:user:id:...', 3600, Object(Closure), Array, NULL)
#8 /var/www/html/includes/user/User.php(527): WANObjectCache->getWithSetCallback('global:user:id:...', 3600, Object(Closure), Array)
#9 /var/www/html/includes/user/User.php(446): User->loadFromCache()
#10 /var/www/html/includes/user/User.php(410): User->loadFromId(0)
#11 /var/www/html/includes/session/UserInfo.php(88): User->load()
#12 /var/www/html/includes/session/CookieSessionProvider.php(119): MediaWikiSessionUserInfo::newFromId('373553')
#13 /var/www/html/includes/session/SessionManager.php(487): MediaWikiSessionCookieSessionProvider->provideSessionInfo(Object(WebRequest))
#14 /var/www/html/includes/session/SessionManager.php(190): MediaWikiSessionSessionManager->getSessionInfoForRequest(Object(WebRequest))
#15 /var/www/html/includes/WebRequest.php(735): MediaWikiSessionSessionManager->getSessionForRequest(Object(WebRequest))
#16 /var/www/html/includes/session/SessionManager.php(129): WebRequest->getSession()
#17 /var/www/html/includes/Setup.php(734): MediaWikiSessionSessionManager::getGlobalSession()
#18 /var/www/html/includes/WebStart.php(139): require_once('/var/www/html/i...')
#19 /var/www/html/index.php(40): require('/var/www/html/i...')
#20 {main}
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