I'm not feeling well
, so forgive my being abrupt.
The dose for Doxy to actually kill the bacteria is 400- 600 mgs each day, so that is most likely the reason you aren't feeling much.
Also, the treatment times will vary depending on how long you've had the infection and which infections you have, as well as any other weaknesses your body my have (thyroid, adrenal, intestinal, etc.)