This sounds like a horrible situation. I hope it gets resolved favourably for you, and you heal nicely.
From my experience as a cyclist, when I filtered, I would ALWAYS stop and look out for motorbikes, when over taking on the right. By taking the decision to filter, I would have to consider all the potential hazards that I might come across, motorbikes being an obvious one. Here the cyclist is accountable for not anticipating such a hazard.
As a biker, whilst filtering, depending on the type of road, and environment you would expect different things. If in a built up area, I would always be prepared to slow down and look out for pedestrians, cyclists etc etc who are likely to emerge from in front of a parked bus, and be prepared to stop.
On something like a motorway, or ring road, where you wouldn't normally find cyclists, or cyclists are not permitted, or you'd have to really have a death wish to cycle there, then it is an unlikely situation for you to have to expect a cyclist, or pedestrian from in front of a bus, BUT it of course depends on the situation and environment.
Car drivers have a responsibility to everyone around them to drive safely and to make the effort to look out for motorcyclists, cyclists etc ESPECIALLY in slow moving traffic.
It is a difficult situation.
I once hit a cyclist in my car. It was dark and I was indicating to turn right and waiting for a gap in the heavy traffic. Other cars where undertaking me, and a few selfish people behind me had full beams on.
I checked my mirrors, checked my blind spot and slowly started to turn whilst still looking out for people. Despite looking, with the full beams in my face, I didn't see the cyclist till the last minute. I just clipped him and he nearly came off. He was going at about 20mph.
I pulled over, checked he was OK, other people were stopping and writing down my number plate and not talking to me.
He admitted that by overtaking a car that had it's right indicator on, wasn't very intelligent, and I explained that, despite him having flashing lights and hi vis clothing, that I STILL couldn't see him, despite looking out for him, due to arseholes driving with fog lights on, and blinding me whilst trying to be vigilant.
Who would have been at fault though if the outcome was more serious??
It's very very difficult.
I hope things get sorted for you soon, with a favourable outcome for you.