GF, I had it happen in a Lear 23 with a friend handflying and he was going into a 45 degree bank when I took over as I had been balancing fuel when I felt level but all three atitude indicators indicated a 45 degree bank. We were still in the clouds over 35,00 ft. It takes a lot of trust to not trust your brain but go by what the instruments say to save the day. You need to do it anyway.