I agree with those recommending dresses, OP. But if you try on many different types and still feel drawn to trousers, I have some remarks.
The ones you're wearing in your OP are tight in the wrong place, loose in the wrong place and too long. At your current stage, you'd need trousers with structure. Pleats may seem counter-intuitive, but you need the volume around your tum to be intentional. Look towards fairly high-waisted styles with generous front pleats - and don't be tempted to squeeze into the tightest size; allow the garment to be the shape it was designed to be.
Go for a fabric with some firmness, not thin and floppy, definitely not jersey. Wide/straight legs are fine but you might prefer wide legs that taper towards the ankle, or a barrel style If they're collapsing round your ankles, have them taken up!
The alternative would be jeans with a high elastane content - at least 4%, more is better. If you're lucky enough to find the right ones for you, they could squash you in, and a longish top could disguise any overspill.
Congratulations on your achievements so far! I hope you're already feeling healthier and better about yourself.