I know well what you mean by weird smell. It is not permanent, but comes literally by waves (from time to time) !
I think it could be the amount of insulin produced by your body when your blood sugar is 3.4 for example.
At times I have been thinking that something was rotten ! I guessed it came from the kidney. I found a way to cure it as follows :
3 teaspoonful of cocoa (I use Nestle) with 2 teaspoonful of sugar in a glass of very warm tea. I drank it twice or thrice daily. That weird smell disappeared after a few days.
I am not a Doctor. No Doctor has been able to tell me what was that weird smell as a residue from the urine. The light pain from my right kidney also disappeared.
I do not know the real source of that weird smell ! if you learn something, please keep us posted. Thanks.
I still drink my cocoa as mentioned above. Feeling also more energy instead of being weak and sleepy with low blood sugar !