HI and thanks for using the forum.
First, I am not a doctor, so I cannot give you treatment advice. I can give you some info though that may help you.
The Arixtra is an anticoagulant that works to thin your blood and prevent more clots from forming. You are right in that it is not a clot dissolver. Usually, Arixtra is used in patients who have undergone a surgical procedure (such as hip or knee surgery) to prevent DVT's in the post-operative period. For patients with an existing clot, I have seen it used in conjunction with an oral anticoagulant (such as coumadin).
I cannot say for sure what your nurse practitioner's plan is for you. However, the presence of the clots in your leg are concerning and are not something that you want to ignore. Clots can form other places and cause serious problems for you. The repeat ultrasound will help the NP see if the clot dissolved on its own or if it moved anywhere. It also can detect if new clots formed.
It would be important for you to take the medication as prescribed by the NP and to follow up as you were directed. It is also important to find out why these clots formed (recent surgery? recent travel? varicose veins? clotting disorder?, etc.) If there is an underlying cause, these can sometimes be treated and there may no longer be a need for the anticoagulation therapy.
If you do need to continue anticoagulation therapy, it is manageable and you can live a "normal" life. Your blood levels (usually your PT and INR) are monitored closely and kept in a theraputic range.
It is your right as a patient to understand your diagnosis and the treatments that are being prescribed for you by your health care practitioners. I always suggest that you write down any questions that you may have and bring those questions with you for your appointment. It can be overwhelming when you start hearing a lot of information at once and it is easy to forget what other questions that you have. Also, you can ask your doctor/NP for any written materials that they may have in regards to your diagnosis, treatments, etc. If you feel that your health care practitioner is not willing to spend time with you and answer your questions, then you should look for another doctor/NP. However, don't put off treatment until you find a doctor that you like. It is important that you start treatment now.
I hope that this info was helpful to you. Good luck.
Not sure if I'm allowed to ask one more or update but I will...
Went back after taking Arixtra shots for just over two weeks, I went back to have a followup ultrasound. I was told that the lesser clot was no longer there, but the more dangerous clot that was closer to the DVT vein WAS still there, though it had backed off just slightly away from the vein (about .5 cm).
The NP now says she wants me to go on Plavix for a while to see what this does. Though on TV this drug is touted as being for heart issues, she says it's also used to treat clotting/vein/leg issues as well. Now, a doctor friend of mine says that in his opinion only, Plavix is one of those "over prescribed drugs", because the drug maker offers perks to doctors who prescribe it. As a personal friend he's trying to not interfere with her diagnosis of me (plus he doesn't specialize in vein issues), but he's still raising an eyebrow over her choice of Plavix. It is after all a serious drug with possible serious side effects (as compared to an aspirin therapy regimen, etc).
I know you obviously can't dispense counter advice on this for a variety of reasons - but maybe I'm just seeking for someone (anyone) who knows about these drugs to tell me if this is true - that in some cases, Plavix is used for, and can possibly help, with leg clotting issues. Or am I just helping to fund someone's free trip to Hawaii from a drug maker's incentives?