It could be Lyme (hypercoagulation),or may be Bartonella (causes inflammation of the inside of the veins). There are things that can be taken to help, like heparin or nattokinase, but see what your doctor would have you use and you will need to be monitored to be sure that your blood gets thin enough, without being too thin.
Herb only treatment for Lyme & Bart ended 12/11 - no active symptoms for 2 yrs -Herb only treatment for Babesia ended 12/12www.healingwell.com/community/default.aspx?f=30&m=2977364
Had Lyme, Bart, Babs, RMSF, Ehrlichia, Myco, Anaplasmosis, EBV
New Lyme case 8/2014 - Healed 1/31/15 - unknowingly had Asymptomatic Babs and Asymptomatic Bart, being treated now though (2/2016)