Hungry 24/7

Ladies help me! I am hungry literally all day every day. Nothing I eat fills me up! I am quite fit and healthy and have a balanced diet. I wouldn’t say I’m an avid healthy eater but I do eat my fruit and veg etc. I’ve been drinking more but this does not help at all!😂 I am active and walk the dog every day for around 30-45mins after breakfast. Then I come home and have a “second” breakfast. Then by 11am I’m ready for my lunch! I have tried to up my portion sizes but ended up getting severe indigestion after I ate. I can’t find anything that fills me up. It’s so frustrating because I’ve never been a big eater so snacking doesn’t come naturally to me at all! I’ve tried snacking on fruit but I’m still hungry. Yoghurts don’t touch the sides at all either and then I turn to chocolate and bread 😂🤦🏽‍♀️ I’ve put on 2 stone, my ass has doubled in size and I have savage stretch marks on it and I’m only 22+4 xxx