Universities say that they are understanding about work experience but you would really need some very long-term nursing home experience to back this up, interviewers do tend to assume you've done work experience with doctors. It is a very tough system, i got turned away from loads of hospitals, the one i eventually got into was 2.5hours on the bus each way! just trying to give you fair warning, don't give up trying, keep applying, abuse any family contacts you might have, go in in person(it's harder for them to turn you away), well done for what you've done so far - those grades should be alright!