Feeling 'Heavier' Then Usual, Extreme Bloating, No Pain

Okay, this is the weirdest thing. I am 27, a vegan and exercise every day, for at least one hour. But in the past two months, I have been gaining weight nonstop and not being able to get it off, no matter what! It has been happening ONLY to my abdomen. I now look overdue, and I can't lie on my back anymore because I can barely breathe. I am definitely not pregnant, and my belly isn't hard; it's soft. I'm not sure what's wrong because I have no pain at all, except for heaviness. I feel like I've just eaten lead or something of that nature. At the same time this occurred, my breasts have been doing the same thing; they're hardy recognizable as mine anymore, and they're so heavy. I can barely walk. Carrying around all this weight is making me exhausted, I look too-pregnant, and I used to weigh 110 lbs, now I am nearing 200 lbs, 90 lbs gained in belly weight alone! The rest of my body is exactly the same. I can't even sleep very well even more, because I can't breathe on my back and my front is sleeping on a football. None of my clothes fit because dresses and shirts can't fit over my belly, and pants obviously don't. And this is BEFORE I get out of bed. After I eat anything, my belly goes hard, but still not painful, and heavier, like I'm eating rocks or something. Evens glass of water will trigger this. Please help!