Is it ok to take ace diet supplements while taking allegra and Zyrtec?

I took my Allegra at about 7:30 this morning and took an ACE at about 10:30 for the first time in months. Around 30-40 minutes later I got light-headed, had heart palpitations, broke out into a clammy sweat, and had all over body shakes. At first I thought it might be because I hadn't eaten in several hours and I try to eat every 2-3 at most, so I ate a Nutra-Grain bar and drank a ton of water. Only time made everything calm down. While it has now been hours, I still feel discombobulated. I will never mix the two medicines again, regardless of what research says it's safe. I need my allergy meds, the ACE will have to wait until the Fall (though I haven't had any success with the new formula anyway).