Do not despair, sagarika! In my experience you are at absolutely the worst stage. I remember feeling exactly the same when at 12 months we added nuts to the list for dd. That meant I she and I (still bf) were to avoid dairy, eggs, wheat, sesame, shellfish and nuts.....
I was endlessly starving, anxious and completely fed up.
I stopped bf at around 15m, not just for this reason, back to work and expressing not made easy etc. She went on to Neocate and after a tricky period of mixing it with bf, she was fine. Our nice and practical dietician suggested adding pureed pear or even golden syrup and then reducing amounts until it was 100% neocate. She agreed golden syrup was not ideal buy hey, none of it is ideal really.
Life is very different now. DD (7) has grown out of wheat which made a VAST difference and, as of last week, we can do egg! Hoorah. Added mustard to the list, but as a swap for wheat and egg, that will do me!
She can go out for a cheeseless pizza, takes her own food to parties, eats better than almost all her peer group and we are all coping ok.
Things get vastly better, honest. You are in the shock phase which I remember well. Hang on in there!