Try to relax [easier said than done] It sounds like you're working yourself up
into a right tizzy. Stop trying to imagine the worse scenario.Your doctor would have had yo admitted to hospital if they thought it was urgent. Calm down, try some deep breathing exercises, it usually helps me if I feel panicky.
There's nothing wrong with taking warfarin. My other half has taken it the last two years and only has to have blood tests every 3 months. Please let us know how you get on. Regards, Cupid04.