Spuddy, you don't say how old your baby is but I'm gonna assume he is still v. young, up to a few weeks. I hope you have good help on the spot with breastfeeding and you can ask your questions in real life, too. I am a breastfeeding counsellor with NCT and I hope I can throw some light onto what is happening and the way forward. There is nothing in your post that indicates to me you cannot breastfeed as happily and satisfyingly as you plannned : )
I am going to cut and paste a bit 'cos your post is long, and it should help me cover it all :)
"My left breast just doesn't make anywhere near enough"
Most mothers have differences in milk production between one side and the other - it doesn't matter. With frequent, effective feeding, even just one one breast can produce sufficient for a baby (think of twins!) and although it's highly unlikely you will need to feed one side only all the time, if you had to, you could.
" and my baby is hungry and also lazy (he falls asleep on the boob after 10 mins and his suction just comes and goes)."
Normal for babies to need bf very frequently day and night; falling asleep after 10 mins can be normal; normal for sucking to come and go in intensity. You need someone to observe a feed and see if anything can be changed, but your description is not worrying.
"We bought a breast pump so i could see what i was making. 20 mins of full/strong suction on the right (not comparable to lazy baby sporadic sucks) gives 1.5oz and 1 hour on the left gives .5oz. Both have been given the same stimulation, but the left has an inverted nipple so i'm not sure if that is why."
The pump does not remove milk in the same way as the baby and it is absolutely misleading to assess breastmilk production on the basis of a pump - it gives you no information at all except wrong information. Pumps can 'perform' worse than a baby, or sometimes better than a baby - 100 per cent useless as a form of assessment, believe me.
"The baby wants 2oz every 2 hours and is unwilling to suck for longer than 20 mins so i don't think exclusive bf is going to work.
Anyway, after another horrendous day and night of just constant feeding and crying baby. We gave him some formula as a top up. He loved it sad He guzzled it down like we'd been starving him and took a solid 2oz every 2 hours on the dot for 4 feeds."
It may be your baby is needing more breastmilk at the moment - you don't say what his weight gain is, what his poos have been like - but that can be fixed, honestly :)
Is the midwife still around?
If you combination feed you risk not being able to bf at all.
I expressed while he was having this too so we had a store of my milk.
So now i think we are planning to combination feed.
Please post again with more info and you can also call any of the bf helplines.
Hope this helps.