Sounds like a few things going on, as others have mentioned. I don't know your financial or other situations, but, here I go.
If it's the shock of purchasing so much, the question becomes, are they purchases you would have made if they were stretched out over time? Is it just that the timing is shocking you? Are they things you need/will they get wear or just leave other items unworn? Do you need to be purchasing other clothing items instead with the money?
If it's the money, should it have been saved instead? Or used for something else? Would you rather have used the money to have one less month's mortgage?
Are you worried about spending the next month's mortgage savings also?
Are you worried that you have fallen into a shopping pattern and you will continue?
Do you need to find another way to deal with stress that doesn't involve shopping? Or eating? If so, there are many choices. Or even have a fun money budget, and decide how you want to spend it. For eating, if it's a problem, I'm considering going back to tracking my food. I went unconscious for 5 -8 minutes yesterday and ate enough to hinder my goals.
I went a while without shopping when I was losing weight. I stopped when I had enough to make enough outfits for that fall, as I expected the fall clothes to only fit for that year, and I was going to be really short on spring/summer clothing. At first not shopping was making me anxious, as I realized how often I used it to get out of the house and get my mind off things, but later I found it freeing.