great post, brocky. certainly a possibility in the original poster of this thread... thank you for your input!
I have been suffering with the same condition for about two years. I went to five different opthamalogists before someone told me that I have conjunctival lymphangiectasia. It is a benign condition but subconjunctival hemorrhages look gross. There is surgery for this condition and right now I am investigating it. Meanwhile, I would recommend staying away from Aspirin , Ibuprofen or any other medication that can cause bleeding.
brain tumor does not cause subconjunctival hemorrhages, so please stop worrying about that. i've never even heard of a brain or eye tumor of any kind causing subconjunctival hemorrhages. no, you do not need an mri. if you have already had blood testing and it was negative/normal, then there's not much else to do.
repeated subconuunctival hemorrhages are from some blood or blood pressure problem. hypertension, diabetes, lupus, sickle cell anemia, other types of anemia, etc. not from any mass in your head or brain or eye. if your other docs have tested you for blood disease, then i dont know what else to tell you. 'idiopathic', i guess.