You poor thing!! I'm so sorry that you are feeling this way. I went through something similar and it ended up being post-partum anxiety.
So you've been to the ENT. Did they stick that black rubber LONG tube into your nose to check your adnoids? Infected adnoids make you dizzy so it could be that.
Also, see the pulminologist - rule it out. It's worth the peace of mind.
Also, since it's been a year almost, I'd ask the doctor for an antidepressant that also treats anxiety (Zoloft or Lexapro). And then I'd get myself in to see a therapist - preferably a female. And just talk - and keep talking. Talking helps so much. She will give you some breathing exercises to try and some imagery.
The meds will take 2-4 weeks to kick in. It could be anxiety and you are just not seeing it. Anxiety is horrible. I have to go away tomorrow and now my colitis is acting up due to stress and anxiety. UGH!!!!!
Feel better!!!