Hi Beka, welcome to the board!
What dose of Doxy are you taking? Ten days is not long enough treatment. From what I understand, six weeks of the proper dose antibiotic is the minimum treatment for an infection caught within two weeks of the bite. The antibiotics kill the bacteria when they are reproducing which is estimated at four weeks. Six weeks of treatment will cover one growth cycle in a new infection. If symptoms are still present, further treatment is warranted. A longer infection needs longer treatment. If you have been infected for years, you need much longer treatment.
It is very important to see a knowledgeable doctor. Many doctors do not understand Lyme and treat with outdated protocols. Besides Lyme, ticks can also transmit several co-infections including Babesiosis, two types of Ehrlichiosis (HME & HGE), Bartonella, and Mycoplasma. Many people who have Lyme are co-infected. It may affect treatment choice and progress. It is important to be tested for these by a Lyme reputable lab such as IgeneX in Palo Alto, CA. Have you been tested for these?
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There are some important tips to know about taking Doxy. Do not have any dairy, magnesium, or iron products within two hours of taking it or it will not be absorbed properly. If it makes you nauseous, eat something substantial and non-dairy before taking it. Avoid the sun. You can get a severe burn in minutes even when wearing sunscreen. Do not lay down for at least an hour after taking it, or you can ulcerate your esophagus. This is very painful. Drink a full glass of water when you take it for the same reason. Whenever you are on antibiotics, it is important to take high-quality acidophilus. They replace the good bacteria and help prevent yeast overgrowth. The best kind to get are refrigerated and have a high culture count.
Are you aware of the Jarisch-Herxheimer Reaction (herx)? Often, when people who have Lyme take antibiotics their symptoms get worse or they get new ones. When the antibiotics kill the bacteria, toxins are released making them feel worse. It can be scary, but it is a good sign the antibiotics are working. During treatment it is a good idea to document your symptoms daily. One way to do this is to list the main symptoms you have each day with a numerical rating of their severity from 1-10. Over time when you review this, you can see when your herxes occur and how you are responding to the meds.
It is also important to learn as much as possible. I recommend reading Dr. Joseph Burrascano's 2008 Diagnostic Hints and Treatment Guidelines For Lyme and Other Tick Borne lllnesses at http://www.ilads.org/lyme_disease/B_guidelines_12_17_08.pdf He is one of the top Lyme doctors in the country, and many Lyme doctors follow his protocols. He discusses antibiotics and doses starting on page 18. I also recommend the books "Everything You Need To Know about Lyme Disease Second Edition" by Karen Vanderhoof-Forschner and "The Lyme Disease Solution" by Kenneth B. Singleton M.D.