I am a hyp patient since 25 years. I increased my...

Dear Customer
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Would your high platelet count caused by your irrgularing using of levothyroxine ?
although its a wrong action to change your medication doses or stop or recontinue it by your self , but its unlikely to be caused by levothyroixine or thyroid hormonal imbalance related issues 
What are the possible causes of your medical condition ?
there is many causes , such as :
1. internal bleeding
2. infection
3. anemia and blood disorders 
4. chornic disease
5. auto inflammatory disease such as rheumatoid arthritis 
What to do next ?
1. stick to your doctor instructions and doses about treating HYP and levothyroxine 
2. consult an internal medicine doctor soon to do the needed medical examinations and determine the treatment pathway
3. needed medical examination may include :
- clinical examination
- blood test
- liver and kidney tests
- bone marror test 
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Kind Regards