I've not worked in 7yrs. Now that I want to go back, I don't know how to account for that time. Suggestions?

I'm almost 27 & have been on disability for PTSD for all this time. I'm much better now, but I don't think it's the best idea to tell potential employers that I was mentally unstable. Should I lie? I was thinking of making up a story that I was sort of like a housewife without the wedding ring. I WAS staying with a guy & we were close, but it was more of a thing where he was taking care of me because I wasn't all there all the time. What should I do?