In reference to your last sentence - your mast cells must work normally for you to get anaphylactic shock in the first place, the issue is that your immune system is sensitised to the venom in the sting. Given that there is no definite way that you can guarantee avoidance of the same allergen in the future you should be referred to an immunologist for consideration of a desensitisation program
Sorry to hear about how much has happened to you in such quick progression  I can imagine it was and continues to be very jarringBased on your description and recollection of the events, you went into severe anaphylactic shock which likely would have been fatal had your husband/daughter/EMS not been around. Will reiterate what has been said already to keep an epipen on you at all times moving forwardOnly other thing Id add to whats been said is you likely may be a candidate for venom therapy. However, it sounds like theres still quite a few things going on so take it one day at a time. Once everything else has settled, you may want to consider connecting with an allergist to receive venom testing  in Canada the 5 main sting tests we do are on honeybees, wasps, yellow hornets, yellowjackets, and white faced hornets. If you test positive for a stinging insect, venom immunotherapy can be 98% effective for the rest of your lifetime. That being said, its not cheap, and it can take 3-5 years of injections at the very leastWishing you all the best in your recovery!