Be persistent with your dr, YOU are your best advocate. Remind her that it happens consistently over time in the same foot (and therefore isnt a bite), and that it is troublesome and needs a new therapy plan. If she doesnt respond, find a new dr. Im sick and tired of drs acting like my problems dont matter and I should figure them out on my own thru internet research and trial and error!
And I have a thread I just posted in General Chatter about lymphatic drainage. There are some people who think that even without "disease" the lymph system can become a little lagged. This can cause water retention, difficult in weight loss (if your system cant purge the body fat and toxins that are released from your cells, it is a problem - kinda makes sense to me).
There are non-invasive treatments that help. I am exploring them myself and listed then in my other post.
Hope you get it figured out