I really would park the idea of a university programme altogether at the moment if you are not up to it - studying full-time (especially at assignment time) is very pressured and you wouldn't be doing yourself any favours. There is no point in a degree for a a degree's sake - people are coming out of uni now with good degrees and still can't find jobs - unless you want to work in a particular area and your degree is in that subject, having a degree makes you no more employable, it only proves that you can study.
Many years ago I was one of only four people in my leaving year who didn't go on to University, I wanted to go to work, I couldn't see the point of further study - but it is never too late, you can do like I did - find the work you like, then study to further your career once you know what you are going to do.
I got my Masters degree when I was 50 - it was far more relevant to me at a mature age than it would have been when I was 21.
The other thing you have to consider is fees - if you go back now, will you have to pay the going rate for student fees? That's another big pressure.
Depending on your course, too, most unis only allow 5 or 6 years for a student to complete, so you won't be able to have any more breaks if you defer again.
I really would advocate that you wait until you feel well and able to cope with the huge challenge of a degree programme - don't force yourself to do it now. It's a far more positive thing to do, that to keep putting it off because you're not strong enough to take it on - and people can understand that.