Tina, the work you do is tremendously important. And I know what you mean about feeling fulfilled. I feel exactly the same. I think it's vital that carers' voices are heard, because the professionals only see things from their side of the fence.
But you mustn't wear yourself out. Ken needs you, and his need will increase, and it's going to be difficult for you to keep a balance.
I'm not going to say give up your LINK work, it's vital that you keep your own identity and know you're achieving something. It's not a question of priorities, you are BOTH priorities!
But don't feel guilty either. You have done enough for today, and you have always given yourself unstintingly to Ken. I'd say, have a rest tonight, then tomorrow try to work out how you are going to balance two of the major factors in your life, so that you don't feel you are neglecting either.
(Not that you are, but I know all about that guilt monster!)
Love,