I have not had this problem, but I might suggest not trying to relax at all in your case. You are likely able to "relax" your heart well enough that you are ac

I have not had this problem, but I might suggest not trying to relax at all in your case. You are likely able to "relax" your heart well enough that you are actually causing yourself to start to pass out. Relaxing your body as part of meditation is intended to help you quiet your mind, but if that in itself is a barrier, then you should try not doing that part. You could instead practice allowing your thoughts to float away, and with your eyes open allowing yourself to "see" without perceiving. Let the goal of your meditation be simply being with the world where you are, without trying to judge or affect it.