Always a shock to get such news horseshoes, but just a few things to keep hold of and concentrate on.
This condition is very much at the benign end of the spectrum - the medication is oral and has very little of the side effects associated with chemotherapy. Control of the platelet count is usually good and well maintained.
It is very likely that you will be attending the Haematology department for many a year yet, with no great interference with your life.
Good luck with it all.