Rediscover passion for your overweight wife

Sometimes when making love it seems to be going OK until I am about to reach orgasm but then I just ‘lose it’ – i.e. there is no ‘feeling’ - it just comes to an end. My wife says she had felt me ‘come’ inside her but I didn’t feel it. This is happening more and more lately over the last few years. I am 54 and we have been together for almost 30 years...