Yeah, if you develop a rash from a tick bite that even remotely looks like it could be lyme, just go to a pet store to buy amoxicillin (you can get exactly the same stuff they give to humans) if you can't quickly find a doctor who'll take it seriously enough to immediately write you a prescription (unless, of course, they have a very well reasoned explanation for not doing so).
The potential consequences of not getting fast treatment are indeed so so much worse than the practically non-existent consequences of taking amoxicillin when you don't need it, unless you're a crazy hypochondriac who constantly thinks they might have lyme.
But hey, also don't blindly trust medical advice from HN commenters telling you to go buy pet store antibiotics :)