You have three issues to address in any CV your create or any job application you undertake:
- what did you do for three years
- the level of claim you can make around the qualification, and further study period
- your health
Let us address the last issue first. Is your health stable now? It doesn't need to be perfect, just stable, which in an employers view means a predictable turn up to work rate and achievement capability. Go and see your Doctor and ask them to assess you for fitness to work - that's different from being able to attend university. Ask your doctor to advise you in writing of what work you are presently capable of, and which jobs you should not be applying for. Its important that you get this guidance, as if you apply for any job and are found to have a known health condition, but stay within the doctors guidelines, then you can't be excluded from the selection process or sacked later for this issue. If the employer asks for a health reference, the Doctor will include a copy of their written advice to you.
Now, what did you do for three years, or at least how do you communicate this in your CV? Always in CV writing, focus on the positive and what the employer wants. No need to raise or address, let alone explain the negative. So I would concentrate on the fact that you gained a degree IF that's what the university call it. You must check that, as many call a "fall back degree" what is certified as an HND, and that's what you claim on the CV. The issue here is honesty and backup, as you have to assume the employer will check with the university what you gained: so always be honest.
Lastly, the level of claim and further study; I have covered level of claim above. Remember that many employers use day release these days to advance those who came straight to them from college and existing employees, so part-qualifications are not unusual. Most employers won't worry about additional study, as long as you don't expect to get paid for study leave, at least initially.
Finally, lets talk about finding and applying for jobs. The employers view of your degree wholly depends on what industry/market you are applying for, as to how relevant they see any certified study you have completed. Employment is about relevance and suitability, not necessarily level of qualification. For instance, lets say you were looking to go into journalism, then your course work and writing capability would be as of much interest as the actual degree: do you have a portfolio? Where as a commercial employer looking for an office worker would be more interested in level of certification and attendance record, as it shows application of time and effort.
In summary, you need to ensure you play to your strengths inside the work scope the doctor agrees. Choose wisely and you can get employed as easily as others, choose poorly and you will always be digging yourself into a hole at some point in the job application process.
Hope that helps - Good Luck!