So sorry to hear this.
Best of luck mate - hope you can stay positive, hope the liver test comes back in your favour and you're eligible for a transplant
Presumably the arrhythmia likely persisting or coming back is part of the issue there, new clot would just reappear anyway. I had an atrial arrhythmia myself (AF in my case) after being under a load of stress and the first thing they did was give me an injection of an anticoagulant to prevent a clot, fortunately they were able to get me back into normal rhythm fairly quickly - that is the important thing as far as these things are concerned, I was told the longer you're in that state for the more likely it is to reoccur or persist - the short circuits the electrical impulses are taking become more and more permanent over time... chances of it persisting increase with age too.
Lots of old people live with a permanent arrhythmia that can't be treated, that can be fine, they just have to take anticoagulant meds permanently to prevent clots, rather unfortunate for the OP that he's not able to with the nose bleeds etc..