OP first of all I am certainly not going to flame you. Being a new mother is so hard. Being a new and single mother must feel impossibly tough. Nobody would find being in your situation easy. You must feel exhausted through and through.
You've had loads of good advice above but right now I want you do do something for you. Make sure your baby is fed and clean and winded then pop him in his cot and leave him there for 15 minutes. He will cry but let him for a while.
Put the kettle on
Brush your teeth then get yourself in the shower, relax for 10 minutes with a good hot shower - he will cry but he's fine... he's safe, he's fed, he's clean...
Now get out of shower, pop on clean clothes ... he will cry but he's fine... he's fed, hes, warm, he's clean, he's safe...
Brush your hair until it shines... remember your baby is safe and clean and fed... even put on a little bit of make up if you like...
Have a cup of tea.. he will cry but he's perfectly safe and fed and clean and warm...
Now give your baby a cuddle
It won't solve your problems but it will make you feel just that little more able to deal with them.
Now are you can start thinking about some of the excellent advise given by others
Being a single mum with a new born is really really tough especially with the sleep deprivation and not being able to get out easily on top of it. I was in that situation when DD was first born and there were days I literally sobbed with exhaustion whilst trying to feed her
PS don't worry about the mess its very common at this stage
for you
for baby