I didnt breast feed for long - so I cnt help on that part. But from reading your message: Are you sure he is screaming for more food? could he have wind?
My son had a bottle every 3 hours - and I mean EVERY three hours! Then at about 3 months i think (it all becomes a bit on a blur!) it went to four hours and tailed off. So I cant see that this is going to carry on and on. So have faith as your son get older he will depend less on breast feeding and you will get into a more normal routine.
I remember how you are feeling - when my ds was young I was literally pulling my hair out thinking my life was going to be feeding and crying forever and that I would never have ME time again. I also skipped meals and felt like I couldnt even jump in the shower, but i promise, hand on heart it does get better, so dont get disheartened.
It must be hard for you with no help at all, what country are you in?
Just some tips - some might help - I brought a sling off the internet called an easy sling (if u want details I will give them to you) my ds loved it. So it allowed me to get meals for my self and do bits and peices. The sling would hold him close to my chest and he was really settled (I think because he could hear my heart beat). You can also use it whilst breastfeeding apparently.
Also if he has a settled minute - put him in a bouncer or something and take him in the bathroom with you - I know that its not ideal but at least you can have a wash.
You have to look after yourself - or you will be no good for him or yourself. I used the baby whisperer book by Tracey Hogg to get into a routine and I must admit this really worked for me.
I have just looked about breastfeeding for you - she says that as babies grow they become more efficient feeders and will take less time breastfeeding - that sounds hopeful for you!
She says they need 4-6 oz each feed which normally takes up to 30 minutes (although bearing in mind this is only a guideline).
Maybe you son is enjoying the closeness with you that breastfeeding gives him.
Anyway I am waffling now, I send you all the best and hope this helps x xps. sorry this was sooo long!!