Yeah, the fade to black or gray is common for me, and it's definitely worse if there's a lot going on in the dream. I've never experienced some of the other things you described though. I think the excitement really kills it at first -- my first LD ended within seconds of becoming lucid, lol. I was like "Yes finally! ...Well crap." I'd also forget to stabilize and it would be a last ditch effort to stay in the dream, when really it should probably be a reflex or just something to do from time to time. Be careful at first yelling that you're lucid, it may... well, cause excitement. But I think you'll be fine and enjoy the feeling it brings if it affects you the same way it does me.