Hi Maurice, welcome and thank you for your question. My name is ***** ***** I am glad to assist you today.
I am very sorry about your issues. How many email accounts do you have in your Outlook 2013?
Have you checked the actual size of the PST file that your Outlook 2013 is using?
Please let me know by replying to me here so that I can help you further.
Thank you for writing back with that information. Can you please check what types of emails are these 4 accounts? Are they POP, IMAP or MAPI?
Thank you for writing back with that information. First, this can happen specially if you are only using 1 PST file for all your email accounts since it can be bloated and very prone to being corrupted.
At this point, please try to BACKUP your Outlook PST file for safekeeping.
Then please try to turn off or disable all plugins in your Outlook. This can be done by going to File => Options => Add-Ins and then click the GO button. Uncheck all plugins to temporarily disable them, then test.
Keep me posted with your results so that I can assist you further.