I had my first Bi-cillin injection 5 days ago. Day #4 I had head and lung congestion. Symptoms continue today.
There always seems to be the question, is it a yeast flare-up or is it a herx?
I'm doing Nystatin and Diflucan, good oral hygiene with household grade H202, Primal Defense and goat yogurt.
I'm very nervous due to the surgery last month when I lost my ascending colon.
Gut protection is a must.
Any ideas?
The fact that you seem to be well covered on yeast meds would also indicate you're ok there. So as long as your diet is good too, I would think it's a herx.
But I've been known to be wrong before! 
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Do not take anything I say as medical advice. I am not a doctor, but I DID stay at a Holiday Inn Express!
oops!
Lymetutu
You're always there.
Thank-you!
Bug
I herx about 24 -30 hrs after the injection for a day or two. Extra tired, achy, discouraged.
With IM Bicillin yeast problems are minimal, according to a power point presentation by Dr J B at www.lymepa.org
Maybe you have a cold?
Some people really react to the first couple shots, others don't. But it sounds like a herx to me but I am no doc just a patient 
The similar thing was congestion in the chest, I had to use my inhaler which I am loathe to do.
Hang on it does get better, I improved a lot on bicillin.