Hi there,
I completely understand what you're going through. I've had my lap band for over 7 years and still get that left side pain. It's almost as though a nerve is being pinched. Some nights I can't sleep on that side, and still (very occasionally) need pain relief. Once the pain was so bad, I was hospitalised and all the saline in the band was removed through the shunt. Instantly, I was better.
My advice - don't overfill your band and if you're feeling pain, have a little saline removed for a short period, then slowly start increasing again.
Also, wear a loser bra (around your girth) - works wonders relieving the pressure if your band is a little higher than most due to your anatomy and location of your stomach.
Last, but not least, I've found anti-ulcer medications help as well - I think that sometimes we get a little stomach acid in the upper pouch and don't know it. Here (Australia) we have many good options available from our pharmacies, so that could be worth looking into.
It's a long road, and no one said it would be easy...although I kind of thought it would be
Best of luck - and remember...if in doubt get a second and third opinion.
Cheers
Cath