I would take a step back and reevaluate what you are actually afraid of. Are you afraid of the BHS itself? Or are you afraid of the beam? If the skill itself is what is freaking you out, I would recommend re-learning it the way you did when you were probably a level 2 or 3! It seems silly but sometimes going back to the basics can help remind you of the fundamentals of the skill, how it should look and feel, making it a little less scary than just throwing your body backwards and hoping muscle memory does the trick. If it is the beam you are afraid of, I would recommend doing other exercises or spending more time on beam to make yourself comfortable. Once you feel comfortable enough to actually attempt the skill on the beam, I would recommend working down instead of up. By this I mean instead of starting on a low beam and moving up from there, start high! I like to have my optional gymnasts learn their skills on a high beam with 8 inchers stacked under the beam and panel mats on the sides so that the beam is level with the mats (if that makes sense). Then as they become more comfortable, they take down layers of the panel mats, then remove them, then remove the 8 inchers one by one until they are down to just one mat. This way, the whole time you are practicing the skill, your beam is just as high off the ground as it will be in a competition. I hope this helps, good luck!