S.H.
Try and seek out help from a Lactation Consultant.
I don't know what your situation is... as you said it is creating problems for your entire family....
When you are engorged, nurse your baby. Or, express it into a bottle. You don't want the engorgement to build up... or it will hurt very much!
have you talked with your Doctor about what you can do? Do you eat well and healthily? Drink enough fluids? Or is it stress related that you are very depleted and losing weight?
Perhaps you need some iron? And when nursing, my OB/GYN ALWAYS emphasizes that you MUST STILL take your pre-natal vitamins. The body needs it. And for your breastmilk.
Weaning your baby... well is he sort of weaning himself? Or still very into nursing? MY concern, would be that if you are not having enough breastmilk... that he is ALSO not getting enough nourishment and nutrients....not to mention, possible dehydration. Unless he drinks other fluids.
Now, is your son still growing/gaining weight appropriately? MAKE sure... because (I don't know how long this has been going on for), but if he is NOT getting enough intake, via breastmilk, it can affect his development too, and not to mention... he won't be getting enough intake during 'growth spurts' and developmental needs. If he is really not getting enough intake a baby will be hungry. And per my Pediatrician, for the first year of life, breastmilk/formula is the PRIMARY source of nutrition for a baby... not solids. Not juice or water.
If you really cannot nurse any longer... talk to the Pediatrician as well...you may need to supplement with formula...and a bottle.
I would really seek professional help from your Doctor or Lactation Consultant or both. Really. You need support for this... someone who understands about lactation and nursing Moms. Don't beat yourself up over it...
All the best, take care,
Susan