Trying to understand persistent GI symptoms. Any insights?

I’m a 24-year-old female medical student. About a year ago my health started falling apart, and I still don’t know why. I went from being active and healthy to dealing with constant nausea, stomach discomfort, lightheadedness (sometimes), heart palpitations (at the beginning), and a persistent globus sensation. The timeline has been confusing, and despite seeing multiple doctors and having many tests, I still don’t have answers. I’m hoping someone has experienced something similar or can offer ideas I can discuss with doctors.

Before October 2024
I was a healthy, active 24-year-old with no major health problems. I was studying medicine and living a normal life.

October 2024 — The beginning of the medical journey
After developing knee swelling, I was diagnosed with juvenile rheumatoid arthritis in my home country and started Methotrexate. I took it for around 2–3 months but stopped because the side effects were very difficult for me.

January–March 2025 —
After stopping Methotrexate, I recovered from the side effects and felt completely back to myself again.

Late March 2025 —
I had one day of diarrhea (late march.. dont know if relevant). I suddenly developed intense dizziness and weakness a few days later. From that moment, my health started changing.

April–August 2025 —
I developed constant nausea, bloating, and upper abdominal discomfort and lightheadedness heart palpitations. I noticed that an empty stomach made everything worse, so I had to constantly plan around eating.

I tried PPIs for about 3 months and probiotics for 2 weeks. Slowly, things improved, but I never felt like I was completely back to normal.

July 2025 —
While being in Germany, I was evaluated again for juvenile RA.

The findings were:

* RF negative
* Anti-CCP negative
* Normal inflammatory markers
* ANA 1:320
* MRI showing a mechanical meniscus problem without signs of inflammatory arthritis
* i underwent gastroscopy, Gastroscopy showing mild chronic inactive antral gastritis
* H. pylori negative
* Previous Campylobacter infection markers (IgG positive, IgA negative)

The doctors concluded that juvenile rheumatoid arthritis/autoimmune condition was very unlikely and that my knee issue was mechanical.

This was emotionally very difficult for me. As a medical student, realizing I may have taken a strong medication for a condition I might not have had deeply affected my trust and confidence.

Late August 2025–January 2026 —
My life became manageable again. I could function, but I still had to be careful with my stomach and avoid staying hungry for too long.

January 2026 —
After going about 6 hours without eating, I ate a banana. Within 10–30 minutes, I suddenly felt extremely nauseous, had hot flushes, and felt like something was very wrong.

After almost 2 weeks, the symptoms returned:

* nausea
* stomach discomfort
* globus sensation
* Lightheadedness (mostly at the beginning)
* palpitations (mostly at the beginning)

I feel physically and emotionally exhausted. The uncertainty and constant symptoms have affected my daily life so much that I had to pause my medical studies.

I would really appreciate hearing from anyone who has experienced something similar or has ideas about what direction I should explore.