The problem of numbness
in hands, feet and in tummy show that there can be chances of neuropathy bacause of the medication you are taking for the renal transplant. The drug tacrolimus is known to cause this type of side effects in patients and these symtomps you are developing can be bacause of this drug only.
I would suggest you to consult your doctor and explain all the symptoms to him and after examination he/she can make confirmation wether it is peripheral neuropathy
or something else. In the mean time it is important that you contiue your medication and only after consultation with your doctor only stop or change the drugs, as these drugs are important to keep the immune system supressed in case of transplant such as yours.
Thanks and take care