bad breath and constipation

so i'm aware that i have issues with constipation / my digestive system bc i barely poop for 4-5 days at a time (even when i do it's just small amounts of pebbles) and it allll builds up until a random day when i end up pooping all the cycles at once within a few sittings and cramps that send me back and forth to the toilet (first pebbles then long soft logs then diarrhea then finish off with a powdery consistency) ((tmi this is gross but it is a LOT of shit. a Lot. like it piles up in the toilet. gross)). (((side note: there were a few times in the past the pain was so much that i've had vasovagal attacks and threw up while simultaneously pooping.))) there's been points before my period where my digestive system was so stubborn that those literal "shitting teas" did nothing for me. (although they've worked on other occasions.) this
"pooping all the cycles" phase happens around my period consistently. recently, i've been taking miralax and it's helped me poop either long soft logs or hard small pebbles every 2 days or so but i'm still bloated and its not helping my bad breath. it's ridiculous, really. i'm so embarrassed about it. the lengths i go to hide it in public make me seem like a closed off bitch who doesn't make eye contact or speak. literally barely 15 minutes after eating or brushing my teeth or chewing gum- anything to freshen up, it's back to stinky hot breath : ( and i've bought tongue scrapers and i brush it but it doesn't really help at all, still a white-ish texture u can’t scrub off. i don't know what to do. i wonder if it's really my stomach issues or if there's another underlying cause. or perhaps my saliva?? i do feel like it’s mucusy and thick sometimes. no idea. help