Is this the product you took?
vitabiosa.com/faq.html If so, it's only a probiotic, so it's not enough to treat the Lyme infection and any other possible infections you have, except if you have candida.
The feeling worse after having the antibiotics is from the die off of bacteria - which is called a herx and is quite typical for these infections. That's why I was asking about
detoxing, as that's the only way to end a herx in a reasonable amount of time.
What's likely going on now - depending on how long ago you stopped them - is likely a 'resurgence' of the infections that you have.
The costochondritis is a common issue with Bartonella - I get it too.
The rash was *likely* part of the die off reaction rather than a side effect of any medication.
So, you need to get started detoxing and then get back into treatments. Is that something you need help with? I'm not sure where you are located (we get members from all over the world), but we may be able to help you find a doctor, or help you with an herbal/alternative treatments?