Hi Ingeborg. I have to go to bed, but I wanted to send you a big hug before I do.You've been fantastic. And you probably need a holiday from Lyme, and Nic. That's OK. It's not abandonment, it's just human.
Whatever you do, don't feel guilty about not doing enough. You DO have your own life and your own stuff to cope with, and you just can't do as much as you'd like to for Nic. It isn't possible. Believe me, I know -- I've been there.
If you're asking about ways to share the load with family and friends, one of the best things you can do is just write out a list of practical small things people can do to help both you and him. Like -- send him a letter that says how much they care; drive him to the doc; take him out to watch the ducks; pick up prescriptions; bring by dinner and sit with him while you go out. If you have a truly sensible and kind friend, tell him/her how important it is to be able to have someone who can drop by once in a while just sit and listen to the icky stuff and not offer stupid platitudes or false encouragement.
We have a friend who drops by and chats for a while every week or two. She's totally unsentimental, and makes it clear that while she is sympathetic and nonjugemental, and she cares, she's not going to get swept up in our disease or be maudlin. She's kind, direct, and talks about things totally non-lyme related. Stays a short while, makes it clear she likes us just as we are, and goes home. What an absolute gem she is!
People really appreciate having something finite and manageable to do. Makes them feel less helpless, too.
You might check out the LoveyOnLyme caregivers group for your own support.
Good luck and hugs to you.