Dealing with IBS and Anxiety: Seeking Advice

Not quite sure what to do with this lol. I just downloaded this app today. I was hoping to connect with somebody who understands or has advice because it's been getting worse recently. I'm a 28 year old female and I was diagnosed with anxiety, depression and Irritable Bowel Syndrome at 18 years old. I just recently was diagnosed with PTSD due to leaving an emotionally abusive relationship last year. Ever since then, my IBS specifically has gotten worse. Anxiety and stress tends to trigger it for me the most. I have IBS-C, which is constipation dominant. I've had yo completely cut red meat, pork, dairy, or any high fat foods from my diet. I have to eat a high fiber diet and chug water bottles all day to stay regular. Lean chicken like grilled chicken or fish is my go to for protein. Most of the time, I go pretty regularly but there are times where it'll flare up and I'll be suffering. It tends to flare up really badly during my time of month. Sometimes I have to rely on 3 ducosate sodium tablets in order to go. Anyone have any advice for me besides what I'm already doing? Maybe something I haven't tried yet? Should I see a nutritionist or specialist for advice? My regular doctor just suggested Metamucil. Caffeine, weirdly enough, is also a trigger no matter how much water I drink with it. oluble fiber tends to be what helps the most for me. Too much insoluble fiber like salads are a trigger. Thank you in advance for any advice!