blood clots

I started IV rocephin (2g/day) in March.  After 2 months, I developed a clot.  My PICC line was moved to my other arm but after a month I got a clot in that arm!   Now my GP is worried I have some other underlying condition that is causing the clotting (genetic clotting issue, blood cancer, etc.).  I'm scared.  My platelets were low but the rest of my blood work seemed OK.   After my first clot, I was put on blood thinners (coumadin) but my INR levels were very low (1.5) because rifampin was counter-acting the coumadin.  I'm not sure if that led to the onset of the second clot or if I have some other underlying issue.  I go to see a Hematologist/Oncologist in 6 weeks....

I had a PICC line a year an a half ago for 2 months without any problems.  Now I'm doing IM rocephin and rifampin. 

Should I be concerned?  On a positive note, I have made some progress with the Lyme.  Rocephin really works for me (IV seems better than IM but that isn't an option anymore  Haha). 

It never seems to end. 

Blood clots are not something to fool around with.  I sure would have them check and make sure you do not have a genetic blood clotting problem as soon as possible.  I speak from experience and only wish I had been warned about it sooner.  My husband had been having clot problems all last year and ended up in the hospital twice with clots.  Since there was no reason for him to develop them I still don't understand why the Doctors did not think to test him for genetic clot problems.  After he went into a full blown stroke that took away all his ability to communicate did they finally test him and found he had genetic Protein S Deficiency and is now on Coumadin. I would rather he have lyme than to suffer as he is now with the aftereffects of his kind of stroke.