I think your physical illnesses may have superceded your dream recall for a bit; your physical body needs you more than your dreams can help. I don't think there is anything "wrong" with you/that. You don't need mental balance at the moment but physical?

We dream as many as 5+ times a night and as you have, one can train one's self to remember lots but I don't think we can remember all and other issues in our life may make dreaming harder/not as high on our list of things we need?

Hope you are getting better physically? It's hard to concentrate two places at once.