“All your tests came back perfect, so you’re fine!” except I’m clearly not

I (23F) have been suffering on and off with different health problems since I was about 15. I remember being in a music class and my teacher pointing out how often I caught colds. That was the first time I realized my body didn’t always work the way it did for other people my age. I consistently catch all sorts of colds all throughout the year, but usually winter for me is one persistent cold. I’ve had tests for several allergies and food intolerances, and everything came back negative, but my stomach is super sensitive, and I sometimes get what seems like random diarrhea. Lately i’ve also been struggling with constant nausea and headaches, that has been very debilitating. I’m also constantly tired and need so much more sleep than my peers to feel just enough energy to get through the day. I also get recurrent yeast infections, cold sores, mouth ulcers…

Thankfully, it gets better sometimes and the intensity of the symptoms has varied, so it’s not always been unbearable. However, I’ve been trying to get a diagnosis since 2021. Whenever it gets worse, I tend to make a bigger effort out of desperation, but when I’m feeling better it just feels so pointless to keep hearing that everything is fine when it’s clearly not. I don’t feel well, I can feel my body struggling to survive, and it’s affecting my work, my life, and my loved ones. I hope I can find answers someday.