What exactly is it about bipolar that scares you? I will tell you first hand it's not much fun, but it is treatable and folks with BP do live long, productive lives with treatment! For me, it used to be the anxiety of not knowing if i have it or not, but once my psych confirmed the suspicion for the 2nd time, a weight was lifted off my shoulders.
Kinda like the MS fears. Some people on this forum HAVE MS and they are fine, and cannot understand why so many others on here get in a tizzy worrying about it. So tell yourself even IF you have BP (and i doubt it, based on your previous posts on the subject), you too will be ok!
Keep talking to a psych/therapist about this fear so you can find strategies in letting this go.