I know how you must be feeling, UnkyUB..........been there, done that, have the T shirt.
The pain and feeling of loss will ease, and you will soon be chatting away on that webcam, and Christmas aint too far away when you consider how the lad will be enjoying the experience.
Don't let the thought of a long flight and you physical problems put you off the idea of having a wee trip to the mysterious orient. I reckon I am a fair bit older than you and it hasn't stopped me visiting folks in Canada, Australia and New Zealand.
I have always found that if you explain your situation at time of booking and at time of embarkation, the girls and boys of the cabin crew will go out of their way to make things as comfy as possible, and look after you a treat ( especially if you travel on one of the far east lines, Singapore Airlines, Cathay Pacific etc.
Go for it ! Just think, if you do go, it will give the rest of us a chance to win the Forumites Challenge.