plz help

happygirl

OK so I tried googling my problem and can't seem to get any where so I have come here for some help , with my first daughter my weight stayed same and at end I also lost some then second pregnancy I stayed same with my second daughter now that am pregnant again with my 3rd and it's a boy this time I started off with 16 stone my bmi was 36 and I weighed my self yesterday I am 21week pregnant I am 18 stone 10 pounds my bmi is 42 omg are u serious I hardly can get food down I eat few full spoons and my stomach hurts and I feel sick where is all the weight coming from I had a scan on my 20th week and baby was 15inch and weight was fine I was obese already when got pregnant so to top off iv gained so much I haven't seen midwife I'll be seeing her tomorrow do u think I should mention it to her I am scared she will shout at me and maybe call me fat plz help if anyone been in my situation thank you for your time