Fed up

I am fed up to the back teeth.
I set out a goal to get a dress on by December 22....
Since I set that goal I have gained 4 lbs.
This is becoming insane, and unbearable.

As someone who is 3 lbs away from the heaveist she has ever been this is not good, I am going into drastic measure centre, and don't know what else to do.

I throw up during a run, I am dizzy, I feel physically sink 90% of the time.
I am sleeping more, I am drinking loads of water, I run 3 to 5 miles every day
weights 2 - 3 times a week, and yet nothing changes.
and if one more person tells me muscle weighs more than fat that person will need to go to the hospital for their injuries.
I can't take it anymore and I can't keep doing this and feel this shit.
Also if I am told that there must be something wrong with me internally I will also scream. My blood has been checked my doctor has told me there is no reason why I shouldn't be able to lose weight like a normal human being.
And yet I don't, can't whatever.