Welcome to our community, Natalie.
It certainly does sound like you are herxing. You are smart that you started detoxing - good for you!
Unfortunately, the rash can appear anytime...it's not necessarily indicative of a recent bite.
But, since you've been hiking a lot lately, and your symptoms recently started appearing...along with the rash...it does sound like it's recent.
How long is your doxy prescript
ion for?
If I were you, I would try to get more so you can increase to 200 mg twice daily.
You will need to treat to symptom resolution plus several weeks AFTER.
We suggest all our new members take a look at the thread at the top of the page titled: "New to Lyme?..Start Here!" It's packed full of good information.
Also, see if you can add in a few more detox ideas - here's a great website with lots:
www.tiredoflyme.com/detox-methods.html