herx versus allergies

Hi all! I have a question regarding herxing and allergies. While on Flaygl for a very short period of time, I experienced aching in my upper back, aching in my chest, and felt out of breath. Now I'm wondering if it could have been a bad herx or if I was having a reaction, which I at the time, thought it was. Anyone out there have any ideas on this or have you had this happen? I got off the flaygl, but tried again a few days later with same symptoms after only 3 pills. Thanks for any input. Hope you are having a pain free Sunday with the beautiful weather finally!

I only stayed on it for five days. So I would say it started second or third day. Then I stopped for a week as per what dr. said. I started up and it started in right away after only 3 pills... One one day and two the next. I was heading toward taking 3 that second day as per script but couldn't I waited again and tried a third time with again same sympyoms plus a dreadful headache as well. So that's what you think? Herx? I was afraid it was allergies.