Doxycycline
"Taking for 3 weeks now for long term Lyme disease. I've gotten nausea 3 times now. When I didn't have food in my stomach is when this has happened.  Also last year I took it in summer and got blisters on my hands and fingers from being out in the sun. I was wearing 75 sunblock on my hands and it didn't help. A week after taking it this year all my lymph nodes got very swollen and it hurt to put my right arm down from armpit lymph node. Also had a headache every day when lymph nodes are swollen. But this is a good sign that my body is trying to kill, flush out the bacteria and toxins."