Young people who have strokes (and in neurology under 50 is young) are at a particularly higher risk for repeat bleeds. The condition he's describing, if he's got it right, sounds a little unusual (and believe me, he is VERY lucky to not be in a wheelchair). If he's got three different answers from three different specialists regarding meds then the results of anything he takes could potentially be unpredictable, this seems even more likely since they ALL agreed regarding exercise and diet.
Exactly...Which is why I said if we found out what meds he is on that he still has options for weight loss.