Hi MarriedtoLymeinNJ. I am sorry you are feeling so bad. When treating these diseases, it is often one step forward and two steps back. But at least forward does happen even though it may be slow.
From what I understand, IV Doxy is caustic to the veins and it is better to infuse it through a port-catheter. The infusion can take several hours.
I see in your other post that you will be on Rocephin instead. It is a much quicker infusion. Hang in there okay? Good luck with your new treatment!