Yes us old-timers have to be aware of "top shelf vertigo". Calcium carbonate crystals break off and get dislodged in the spirit level within your ear. It can take a few weeks for the crystal to dissolve or get dislodged and for normal balance to resume. You may not know you've got it until you do an odd head orientation. and what do you do at the top of ladders?
www.dizziness-and-balance.com/disorders/bppv/bppv.html