Talk to Gastroenterologist on Canker Sores And Acidity

I am a breastfeeding mom of 18 month old baby. I feel acidity on and off and sometimes get a lot of canker sores in my mouth and feel like my tongue muscles are stiffening. I also feel pain while eating spicy or drinking soft drinks in liver but this happens off n on. I feel like there is any liver issue. Kindly let me know is there anything concerning?

I am also facing dehydration issues since 3 to 4 months and even had pain while urinating but it's recovered. I feel dry mouth oftenly. Are the symptoms related to dehydration or something else. Which doctor should I visit for proper diagnose?

Ps. I have noticed this since last 3 months that whenever I get my periods everything gets fine like no acidity, no canker sores, no pain in liver and no dehydration issues.... but jesay hi days khtm hotay hain i get these symptoms back till the next cycle start. I have normal menstrual cycle of 30 to 34 days.