Sounds miserable! It's been a terrible cold season, for sure. But good news about the POTS! My child had two different colds in the past month, and she very rarely gets sick, so I wonder if you are being reinfected with different cold viruses. At any rate, it sounds like you are doing good things to support yourself, whether it's a herx or colds. When I fear colds, I bombard myself with supplements (Source Naturals Wellness Formula, Emergen-C, liposomal C, elderberry, echinacea, zinc, selenium, olive leaf, essential oil of oregano, hot herbal teas and infusions, neti pot action, and lots of gargling with warm salt water) and rest.

You said you just finished a round of abx - so you are not currently on them, right? I agree with not starting another round right away if you are concerned about fighting off a virus. To differentiate from a herx, I might consider other symptoms. Do your herxes often involve sore throats? Do you have EBV in the mix of co-infections, which can cause recurrent sore throats? The POTS thing is mysterious, though, as for me a cold or a herx both make POTS worse.

I would herx from Bartonella and had recurring sore throats. They were mild but it was from herxing for me.

Isastis is a good anti viral herbal but be sure to check with your llmd or practitioner. Check for and be aware of side effects and contradictions.

Take care.