$#@! You have my sympathy. Ome of my most senior cats is going through this as well. She seems to have had a stroke (front and back legs go at a different gait,eats and drinks heartily every other day but drops food from her mouth) When she's napping she just wants left alone but when she's awake she wants company, and then falls asleep cuddled up to me. Whatever the decision at the vet's, it'll be one of the hardest decisions you have to make. Like they said, follow your instincts and your heart.