Soundsnlike your really struggling. I would be starting solids like you would have at 4-6 months is you werent doing BLW. eg. Starting with single foods, pureed for a few months, then starting mashes with chunks then finger food. Some kids just dont do well with BLW...maybe your bub is one of them. Start of as if he was 4-6 months as hes hasnt learned to eat yet.
Failing that i would be getting a 2nd opinion.