My hair has been coming out clumps in the shower i am 24 just diagnosis with hypothyroidism and low platelet count should i be worried?

This is serious: I'll bet the hair stuff is telogen effluvium and I expect when your thyroid is managed it will remit, but you need to monitor the low platelets carefully and see whether your physician working with you can't find a cause. Be sure to let your physician know of any meds you are taking -- including "holistic" meds that are often not what they are supposed to be, and whether you drink quinine.