Doctors help? IBS

Hi there. I need advice. I know I’m not a doctor and probably the people reading this aren’t too but i asked in my title if one can read this.. anyways.

So for the past month, I have had difficulty eating. For 5 weeks I haven’t consistently been eating meals, I’ll have a snack here or there, but it’s looking like a half sandwich a day of food that I am consuming. 4 weeks ago I went to a Urgent care. I wasn’t eating for a week, I was constipated as fuck couldn’t sleep and yet I feel like I’m starving. I want to eat but I can’t. Anyways the doctors told me they didn’t know what’s wrong. Referred me to the ER and I left. I didn’t go to the ER because I don’t have insurance and I honestly didn’t think it was a big deal. Well here I am, every morning for about 2 weeks. I’m waking up with extreme pain in my stomach and me running to the bathroom, not even having time to wake up. The sharp pain goes away once I poop but this is an everyday thing. Every single symptom i had I googled and led me back to IBS, (irritable bowel syndrome). It was said that this doesn’t commonly get diagnosed and it’s often overlooked. Which hey MAKES SENSE THEY DIDNT KNOW WHAT WAS WRONG WITH ME. So I think I have this. I am making an appt to the gastroenterologist soon since I do think this but I’m scared because I don’t know if something is really wrong and it’s my body telling me I’m in pain, or if my brain is being stupid and making me think I’m in pain (which is why I didn’t go to ER, I figured it would get better)

People who have IBS - what is it like for you because I’m really certain I have this, but I don’t wanna be that person and “self diagnose” myself when I know I have no training.

And doctors - is it possible for me to just be over thinking and something really isn’t wrong? I’m in a battle with my brain thinking “is something actually wrong and I need to go or am I just over reacting” I’ve been super hungry and I want to eat. I know I need to eat. But I can’t and it isn’t on my mind until I think back to what I ate last and can’t remember. I don’t wanna say I have a eating disorder because I am really trying to make myself better and eat but at the same time I just can’t and don’t feel the urge too. I’ve been super exhausted too which makes me think since I’m not eating my body is eating itself for energy.

I just need advice. Before I go to the gastroenterologist and get told nothing is wrong. I’m worried something’s wrong but I don’t wanna go spend the money if it isn’t. Also is it stupid to go to a doctor with a self diagnoses (because when I go ima tell them I think it’s IBS, since all of my symptoms lead back to that in some shape, way, or form)

Edit - I thought it coulda been pregnancy maybe at first bexause when I went to the doctor he started asking me “do you feel bigger than normal , last period, etc”. But that wouldn’t stop me from eating while still feeling super full but starving and I started birth control, and a few days ago I started my period (I think it’s really breakthrough bleeding since the birth control is new to me, but it can’t be pregnancy right since I mean I’m on my placebo week and I’m bleeding like I was told was gonna happen)