Coumadin interactions

  Is there a web page that exclusively addresses interactions with coumadin and other meds?  I have a factor XII deficiency and will be on coumadin the rest of my life and Tues my INR was 7.1 - drawn Tues evening.  Yesterday I was instructed to go to an ER and it was down to a whopping 5.9.  The ER discharged me and I'm off to have another PT drawn this a.m.  So, you see this information is urgent for me.  I'm on string of meds and I HAVE to figure out what happened ASAP....   I haven't taken any meds since Tues morning simply because I was feeling tooo tired to get up and thank God I skipped the Tues coumadin dose.  Can the HEAT do this?  I'm an active 41 year old mom and was cleaning in the garage for the previous few days....  Well.  I'm good and anemic now and grouchy... any information will be greatly appreciated!    

[Cleveland Clinic, MD]

Dear Lisa,
Thank you for your question. I am sorry to hear of the difficulties you have been having.  Hopefully these problems with be smoothed out with continued monitoring and adjusting of your medication dose.  The following is information on warfarin and it