What you've been experiencing does sound like anaphylaxis.  It doesn't really matter what you call it... MCAD, IA, etc...  Unlike people with food allergies, you don't necessarily need to use an EpiPen every time.  It's a really good idea to have one with you (!!), but here's what I do first: as soon as I get one of my early warning signs... hives, dizziness, pain in my stomach, a feeling that I'm "off," etc... I take 50mg of liquid Benadryl.  Usually that's enough if I catch a reaction early.  I've learned not to wait and see how bad it gets before treating myself.  If things are not better within five to ten minutes I'll take an extra dose of H1 and H2 antihistamines.  The next step is to add prednisone (60mg).  If that still isn't working or I'm having a very fast/severe reaction, then I would use an EpiPen... especially if I felt like I was going to pass out or my throat was swelling.  If you use an EpiPen, call 911 or have someone drive you to the hospital... don't drive yourself.  Lay down so your body doesn't have to work so hard to maintain your blood pressure.  

Ask the doctor who diagnosed you with MCAD for a Rx for EpiPens... get a "twin pack" (two of them hooked together).  If you use one take it with you to the ER and they'll give you a new Rx.  I've only had to do this once in the last two years!  You'll eventually get more comfortable treating yourself (which will reduce your stress!).  It's much better for everyone if you don't have to spend a lot of time in the ER

Heather

Dr Castells definition of anaphylaxis is a sudden severe reaction that may be life threatening if not treated immediately. Your symptoms could be reacting and/or anaphylaxis. The thing is this--if its building slowly, its probably mast cells being bad--reacting... if its sudden then its both reacting and probably anaphylaxis.. the good thing is,  we treat them the same way...

Heathers advice is excellent. Im very much hoping that as you change your meds for the better you will be much more in control of it yourself like Debbie is now--and shes a supermom You can do it---just dont be afraid to take more meds... in the end you will see that fear to take meds keeps you sicker longer and more meds means YOU control it, it doesnt control you
hugs
Ramona

The only purses I buy now have different "sections" the middle section is epi's, dye free benadryl, zantac, allegra and a copy of a quick emergency version of my condition for emergency use. That way no digging, reach in and grab!