Hi gracetiger. What exactly is the titer test you had done that has 1:40 as the result?
As Gracie's Mom posted, the IgM Western Blot shows a more recent infection and the IgG a longer-standing one. Band 41 is often the first band to show, and band 31 is a Lyme-specific band. No test is completley reliable, and some people who have Lyme do not test positive. Were you tested for the co-infections Babesiosis, Ehrlichiosis (HME & HGE), Bartonella, and Mycoplasma? This is important.
When Lyme disease is a possibility, I believe the most important thing you can do is see a knowledgeable doctor. If you need a recommendation, feel free to email me.