I want to pull my hair out

Can someone please offer advice and tell me I’m not completely crazy

Ive been having health issues for the last year and I’m feeling so defeated. It initially started with what I thought to be mild food poisoning, but it persisted. Overall my symptoms have been constipated, diarrhea, abdominal cramps, anxiety, depression, brain fog, fatigue, wack sleep schedule, I feel like I have a constant post nasal drip feeling, migraines have been more common, horse voice, loss of appetite, and I have one swollen lymph node in my neck.

I’ve had a ct with contrast on my abdomen, an ultrasound of my abdomen, transvaginal ultrasound, stool samples to check for bowel inflammation and parasites, bloodwork has been cbc, metabolic, vitamin, and thyroid (only tsh and free t4) and literally the only thing that was off was my tsh.

august tsh 5.4

dec 8.4

feb 19.5

on my period i cannot eat food without running to the bathroom less than 20 minutes later.

do you think my thyroid is the sole cause of this or is there another cause? My pcp wants me to go back go see my gi doctor but I’ve already said I don’t want to do a colonoscopy because she only wanted to look for an ibd and my calproctein was a 9 (which is good little inflammation present)