Could it be anxiety? I got most of those symptoms all of the sudden last July. One day my face went numb and my stomach was on fire so I went to the doc. Turned out it was anxiety. The lethargy, short term memory problems, declining eyesight and inability to focus on things people are telling me came later, but have been a problem ever since. With everything you've been through, maybe it's something you should get checked out. I've been through more than my share too and it bottles up. Not to sound cliche, but when it pops it'll ruin your world.

Hope I'm wrong and it's something that can be fixed with antibiotics. Good luck man. Keep us posted.