Main problem for diabetics with eyes is damage to the blood vessel in the back of the eye.
The good news is that you don't seem to have that because they have looked into your eyes and checked.
So you may have to look beyond diabetes for the cause of your problems.
I haven't heard of diabetics losing a sense of taste, or suffering from small pupils, so again this is not an obvious diabetic problem.
Have you seen someone who specialises in loss of sense of taste, and eye problems?
It may be that the pains in your abdomen are not related to your taste and vision problems.
Whatever, keep on pushing your medical team to find out what is going on.
Cheers
LGC