Famvir Day Five (worst day so far

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Yesterday I went to a family event to celebrate the belated b-days of my mom & niece. It was at their house and all I did was sit in the car, walk a few steps, and sit again while they opened gifts & we had dinner. My HR was never high and I felt okay. I was very happy to be able to go and felt good about it afterward.
However, today I feel incredibly sick as if I have a flu or minor version of mono. I have headache, nausea, extremely severe fatigue, muscle pain, shortness of breath, and I am freezing to the core (but no fever and I literally never get fever.) At first I thought I over-taxed myself yesterday but then started to remember that Dr. K told me that sometimes when you start Famvir, you feel sicker for the first month before you feel better.
If that is the case and I am sicker today b/c the Famvir is actually working to stop the virus from replicating, then I do not mind. I communicated w/my Dr by e-mail yesterday re: the headaches & nerve pain and he said headaches are very common side effect from Famvir and asked me some questions re: the nerve pain (if only on one side of body, what is my exact dosage, etc.) He wants to monitor the first 2-3 wks before we increase the dose and I feel very blessed that he is following me so closely.
I am wondering from those of you who took Famvir (or other anti-virals) did you feel sicker during the first month and is this normal and it will go away? How can you distinguish the difference between a crash and the anti-viral working? I really do not think I over-did it yesterday and have had days where I've done far more than yesterday and felt okay.
The Vit B-12 shots & methyl-folate have not arrived yet (so symptoms not due to those) and I am certain it is not from the Epicor which seems to be pretty benign.
Thanks for any advice or feedback. I love all you guys and you keep me going on days like this
