I know this is old, but whatever... It could fit someone's situation now. In fact it can take a person 10 years to realize they have cyclic thrombocytopenia, for that matter.
This is up my alley for the cyclic thrombocytopenia, but I'm male. But yes, periods and cycle are expected to go together often with females and cyclic thrombocytopenia.
And, don't expect hematologists to know anything regarding any of this. This is what I have found. Diagnosed myself after a year, and couldn't even get the first doctor to respond to the evidence. Second doctor had never heard of cyclic thrombocytopenia, but at least proved that I had it by taking me off of any drugs. Since my cycle performed beautifully on its own.
My third doctor almost stopped a surgery, even though he should have known my platelets were raising. I was at 400 by the time of the surgery, but it came down to the last day to get the ok. I knew my platelets were fine.
What's wrong with this picture? When you know what you're doing, you just need a doctor to stay out of the way. You mostly just need the doctor for the blood tests and the drugs. And hopefully keep track of how your liver, etc. is handling the drugs.