An update on my post: My porta-cath was removed a few weeks ago in a day-surgery procedure. Very simple, straight-forward and painless; local anaesthesia with something to calm me down (I was almost asleep during procedure).
I'm probably not having another porta-cath inserted at this stage, as iv chemo will most likely stop soon and in the meantime my arm veins are still good.
As for the thrombosis, I am on Clexane (self-injecting daily) for three months.