I personally do not think 3 weeks of treatment will cure lyme. So I am not surprised you don't feel totally well. I am very happy your other tests are negative.
I know that is good news and of course I am happy about it I am just shocked. I still don't feel too well things are still aching and other things still going on is this still possible? My anxiety has reallyyyy gotten the best of me for these past few months and I am not myself :(
That's good news, then. Try to enjoy it! It should remove some of your worries.
Sleep enough, eat good food, get some exercise when you feel up to it, and give your body some time to heal.
Your doctor sounds careful and thoughtful -- that's good! Take care of yourself and of your body.