I've had a similar thing happen to me when I was over at BGT. I rode Sheikra a few times during the day, then went back at night. On that night ride, I noticed that I didn't get that feeling on the drops. (Believe I rode Montu and Kumba before this as well) Then about a year ago, I went to Disney and went on Space Mountain. There were those feelings agin. My suggestion, just give it a rest for awhile, and hopefully, you'll get that feeling once more.