Think I've found out what my feet problems are, more by luck than knowledge, at this stage I think it's a condition called PPP, which is palmar planter psoriosis which is apparently linked to diabetes and liver disease, from the information I have found it indicates that it can be treated with UVB treatment and creams and lotions, one cream that kept appearing in a site was Derma Rescue and seemed to be quite a few people's saving Grace! Fingers crossed I will somehow manage to get mine sorted.
I have PPP and that was the first thing I thought of when I saw your photo, but you usually get pustules with it.
there is another similar condition, Palmoplantar Keratoderma (PPK) which from what I can find is very similar with the thickening and splitting skin but doesn#t appear to have the pustules.
The only way to be sure is to see a dermatologist who can often tell by sight, but they usually take a small biopsy to make sure.
I know quite a lot about PPP having had it for 10 years, but know very little about PPK so I don't even know if the treatment is the same.
For comparison, here's a photo of my feet when the pustules are first coming through, after a few days they start to dry out and that's when the skin starts to thicke, and when that eventually peels off it leaves red skin for a few more days till the next lot of pustules come through. There are many different treatments for it, it's just a matter of trial and error unfortunately. But I will say that most GPs don't know much about PPP so it really does need to be seen by a dermatologist, have you got your appointment yet?
*I can't upload the photo, apparently it's too big and I don't know how to make it smaller, sorry.