Major calendar sync fail! Samsung calendar google calendar fiasco. Please help

[Maybeso]

Im using a samsung note3. I have been using my caldenar on the phone and been adding events selecting the google calendar option so it saves on my gmail accnt. I have had issues where all my things went blank because i saved it on the general my calendar thing and wasnt backed up.
but just today i realized my photos havent been updating to google+ so i wemt thru to update that and probably while i was doing i "synced" my other stuff including the calendar. However now all my past 6 months of calendar info has disappeared into a complete blank. What i dont understand is how this is possible that i have been adding and saving all events through selecting my gmail accnt calendar. How all these didnt sync to my google accnt and rather synced backwards so to speak. Is there any way I can fix this and get my events back?
I tried downloading google calendar separately again but that didnt do anything. I also didnt set samsung accnt to back up so am i doomed?

I hope im writing in the right forum. Please redirect me if i should post it somewhere else. I have googled regarding this and i see lots of former threads but im still confused.

Thanks so much to whoever can help!

 

[B. Diddy]

Welcome to Android Central! Moved to the Note 3 forum.

Photos sync with Google Photos now, not Google+. When you say you updated your photos to Google+, do you mean you went to Settings>Accounts-Google>[your account] and looked to see which Google account components were set to sync and which weren't? If so, did you see that Calendar was unchecked, and then you checked it on?

Are you using the Samsung S Planner app for your calendar? Have you checked its settings to make sure it's syncing all calendars that you're interested in, and also that it's set to display the calendar in question?