Marilyn, how really difficult for you.
But even in your sadness you should remember that Warp was very lucky to find you and to enjoy your love and care for so long.
Some time ago I had to give daily injections to an elderly cat, who had wandered in and adopted us - I really hate needles, but found that when I had no choice it was do-able. Whatever you decide, you've been a wonderful family for Warp and I'm sure he loves you and knows how much you care.