Hi NyLyme. I am sorry you have a positive test, but it is good to know so you can get treated.
Below is a Lyme symptom list. You can have any combination of symptoms.
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 Many doctors do not understand Lyme and treat with outdated protocols.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? I am not a medical professional, but to me your symptoms sound like they could be from Lyme and Babesiosis.
200 mg of Doxy daily is not strong enough for Lyme. I believe the recommended dose is 300-600 mg daily with 400 mg often prescribed. There are some important tips about taking Doxy. You may be aware of them since you were on it before. Do not have any dairy, iron, or magnesium products within two hours of taking the Doxy 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 take antibitoics, make sure you take high-quality acidophilus capsules at least two hours apart from the antibiotics. They help to replace the good bacteria and help prevent yeast overgrowth. The best ones to get are refrigerated and have a high culture count (such as 9 billion per capsule). Most healthfood stores have them.
There are some excellent Lyme doctors in NY. If you need a recommendation, you can email me at email@example.com
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 are killing the bacteria, toxins are relased making them feel worse. It can be scary when it happens, but it is a good sign the antibiotics are working. It is important to do things to support the immune system and detox. During treatment, it is a good idea to document your symptoms daily. 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 Illnesses 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. I also recommend the book "Everything You Need To Know about Lyme Disease Second Edition" by Karen Vanderhoof-Forschner.
I hope you can get properly treated soon.