You are doing so well Lela, especially as you are doing this on your own at the moment. I totally understand about the lack of sleep and managing depression and being able to cope.
If you can, and I expect everyone tells you this anyway, try to sleep whenever your son does to keep your sleep topped up. Have you tried co-sleeping at all? I wasn't sure about it at all until I accidently tried it when my ds was around five months when i fed him lying down in bed for the first time and we both fell back to sleep, instead of sitting rigidly up in bed with a pillow and then trying to pick him up and transfer him to the cot without waking him. I don't know how I would have survived without that extra sleep.
Now a year on I actually get far less sleep than a year ago as my monster will no longer co-sleep and if brought to bed will promptly either bounce on me or just slide off the bed and wander round the room clucking happily while he puts any available electronic gadgets into the pint glass of water beside my bed. Oh the joys.
I understand about maybe wanting to stop bf if it can help you cope better. You have done fantastically well to get this far and no-one is going to judge you. If you are not sure that you want to give up, you could try perhaps introducing some formula just in the evening / night and see how it goes?
I desperately wanted to ebf my ds but because of my major post birth mh problems I wasn't able to and introduced ff from 3 weeks and mixed fed until 8 weeks when my ds very unexpectedly rejected the bottle. Formula isn't poison and there are advantages in mixed feeding when you have mh problems in that it is more filling so a feed may be quicker and it can give you more of a sense of routine, especially at night - e.g. you can go to bed thinking well my ds had a feed an hour ago, he will probably wake in x hours for another one.
whether or not he will do this is a completely different matter, but it can be a mental help when you are lying in bed exhausted and trying to go to sleep but unable to as you cannot relax as your baby may wake any second for a feed.
Whatever you decide, do it for you and you alone. your son has had all the benefits of bf for five months, but he needs a mother more who can have enough sleep to cope at a really difficult time when you haven't got much support.
ps I have a funeral dress, a really plain, sober black dress that I intended to get rid of because it was too drab to be a lbd, but then after several years of lurking in the wardrobe with tags I looked it out for several funerals which unfortunately have happened this year.
Looking at your wardrobe, is there anything that you can wear - doesn't have to be black or a dress that you can fling a smart coat over with some accessories? Please don't worry about your appearence and trying to impress his family; as someone whose family members died this year I can honestly say that i don't think it registered at all what other people were wearing. And i wouldn't have judged at all or remembered (except if it was a fluffy pink bikini maybe).
Take care x