I'm still figuring this part out myself, but I'd say the most important thing is developing communication. It's important that you express when you're in pain and what you can and cannot do. For your partner, it's important they understand that you have these limits and that they listen and support you when you aren't able to do things. Since PR is an invisible illness, you have to communicate and your partner has to listen to what you're saying. You cannot assume your partner knows what you're feeling and your partner cannot assume you're fine. Communicate always!