Warfarin Sodium and friday night

Last week I had an issue with my INR - it has always been unstable, but this time was weird. My INR had been 6 and so I stopped the warfarin for 4 days, and went back on my regular 2 mg dose. Then we went on holiday to Washington DC for a week. 3 days in, my pee was the colour of cherry kool aid. Went to the local hospital (thank god for travel insurance). My INR was 7.89 - In the US this is considered critical and I was admitted, and treated with Vitamin K and 2 units of plasma. Within 8 hours my INR had dropped to 1.8 - now too low. The next day down to 1.25, and a week later I am still 1. I am taking fragmin now until I can get my INR theraputic again but Fragmin shots are even worse than warfarin.

An ultrasound showed now issues with my bladder or kidneys, but I do not understand why I was bleeding.

Guess that this just shows the importance of regular checking of INR levels while on warfarin.