You have such an amazing collection! Your Jypsiere is so pretty, I really really like its color (rubis?)!
I have the funniest story getting hooked to Hermes as I was disappointed years ago when I got my first H bag! I didn't understand what all the fuss was about as I found the bag rather unpractical..
But then a year later or so I got my first 35cm Birkin and a few scarves and off I went- there was no turning back!
I really can't give you any serious advice how not to go "overboard", but maybe try to buy only items that you really end up using. Take time to make buying decisions and try to avoid going to the store constantly. It took me some time to realize which bags and smaller accessories fit my lifestyle and needs but nowadays it's easy not to buy stuff just because it's Hermes or a new color etc. i know what I use and how so I know already which items are not for me. Also a strict budget will help you to steer away from unnecessary buys. Last year I allowed myself to buy only a few shawls and apart from that my DH got me a bag to cheer me up. Loving Hermes turns easily into an addiction (LOL) so making a plan and wishlist on items you may want to buy in the future might be a good idea.
Enjoy your collection and many more orange boxes in the future!