wanna lose weight asap/pls explain what's happening🥲

tldr: 25 F, 4' 10", apple shaped body (with unusually, naturally muscular legs; i was never an athlete growing up lmao so thanks, genes, for that), 150 lbs, (gained over 30 lbs in less than a year, wtf?? how?? and how do i lose it without starving myself🫠), wanna lose fat asap

so here's the sitch: i'm 25, female, non-alcohol and non soda drinker (water, milk, coffee, and tea drinker). here's where it gets kinda silly: i got back in july (it's april 9 rn, for reference) from over 2 years living and working in West Africa (i'm a returned peace corps volunteer) where, due to the extremely restrictive diet (literally ONLY ate rice for all meals over 2 years), intense heat, and lots of field labor, i lost a lottt of weight (i started at 144 lbs, came back around 115 lbs), and since then, i've been gaining it back and more.

but wait, there's more: i have been running about 5 miles, 4 days a week since january, and have seemed to literally GAIN WEIGHT since then. bruh. wtf is happening?? i feel bigger, but not necessarily stronger, so i'm not sure that it's muscle i'm continuing to gain. i am also currently experiencing pretty intense gut issues, where i feel like i am constantly constipated (even though i have bowel movements every other day), bloated, and like i said... I KEEP GAINING WEIGHT!!😭

pls help:') any insight is helpful!!