I went to hospital today because my chest feels odd. discomfort at times. they said i should be fine, probably not a blood clot. im worried about clots due to high platelets. my blood pressure read 135/84 ish 3 times, hours apart. why is it high?

The blood pressure goes up with discomfort and may be due to undiagnosed conditions. That’s why it is critical to follow up in the office with a primary care doc or cardiologist in order to have proper diagnostic work up.

It is not feasible to provide an opinion without additional history, physical examination may be some tests. It would be prudent to see your doctor to see if you may be depressed. Depression is treatable. Counter-intuitive as it may seem, exercise may help. Start with low intensity exercise such as walking and gradually increase the intensity as tolerated. Drink more water. Wish you good health!