Hi there. I am having very similar symptoms. I just turned 46 a couple days ago. I believe i am starting menopause because sometimes i wont get my period for s month and sometimes i will get it twice a month. They have always been heavy but now it is very heavy. Anyway for about 2 years almost my belly has grown so big and fast. Round just like i am 6 months pregnant. Im not. I had a tubal ligation 18 years ago plus you have to have sex lol. I have gained weight in other areas too but my belly is so embarrassing. I too was usually 140-145lbs. Now i am 220. Most i have EVER weighed in my life. My 3rd pregnancy 18 years ago made me weigh 160. At that time, that was the heaviest i ever been until now. I do eat alot of sugar no exercise but i am really scared about my hard, bloated pregnant looking belly. I can't wear anything. Nothing hides it. Thank you for letting me vent. If anyone has any comments to help me figure this out, please please let me know. Be safe.