Oh Yas I hear ya!
My DD is 3 months and it had been HARD work getting to here.
I see why it can be given up.
I have learnt that during growth spurts DD is fussier. I too have a great left side and weaker right.
I'm currently recovering from gastro, which I thought for sure will effect my supply. DD is also going through a leap (wonder week) so it a clash at the mo.
BUT never doubt your supply.
The stress decreased it. Lots of water and I have found when I nap its better.
I haven't started solids yet, but have had to formula top up say once a fortnight.
My afternoon supply seems to drop and depending on lil miss, she will refuse to feed.
It's hard, but never doubt it.