Pulmonary Embolism Support Group
By far the most common form of pulmonary embolism is a thromboembolism, which occurs when a blood clot, generally a venous thrombus, becomes dislodged from its site of formation and embolizes to the arterial blood supply of one of the lungs. Symptoms may include difficulty breathing, pain during breathing, and more rarely circulatory instability and death.
But that condition is totally different that what you mention. There are many things that it can be, even some soap products containing strong chemicals that can lead to the same symptoms as you mentioned. Borrowing from Healthline: "The symptoms of soap poisoning will depend on how the affected person was poisoned and how much contact they had with the soap products. If the soap or detergent has come into contact with your skin, you may have irritation, small holes, or even burns on top layer of skin."
Again, could be anything which is why its hard for your healthcare professionals to determine the cause.
I hope this doctor is able to help you. That's gotta be so frustrating and uncomfortable.
Concerning your skin condition, I did see something on an emergency room television show that sounds similar. This lady had gone to her dermatologist complaining of an extremely itchy scalp. He was not able to make a diagnosis.
Now it had gotten so bad that she was in the emergency room. She too had very small holes in her skin. The emergency room doctor was very perplexed, as well. While he was inspecting one of these holes he saw somthing poke out of the hole, and then go back in. Turns out, it was some kind of worm. How she got these worms that burrowed into her scalp they didn't know. They were able to get rid of them for her.
I'm not saying you have worms, just sounds sort of similar.
http://www.webmd.com/skin-problems-and-treatments/morgellons-disease-what-is-it
However, this doesn't answer your question about clotting. Sorry. I was just responding to Lemanns.
Indwen
Truthfully, I think most antibiotics will affect INR (or can affect it anyway, it can be different for every person), so it wouldn't matter if you asked for a different one. If that's the treatment you need, your INR can be managed around it.