I'm really sorry to read that you're facing some issues at the 6 month point, Data. My thoughts and prayers are with you as you make decisions about what to do next.
While you're deciding, if you have no objection to natural immune boosters, you could try taking Olive Leaf Extract (get the best you can find) and Vitamin D3. Here in Australia I buy Comvita MediOlive 66 (
http://olea.com.au/benefits/). Of course these will not cure, but may help you feel better and to cope with vulnerability to infections.
All the best ... I'll be watching for your posts.