After receiving the vaccine there was a gradual worsening pressure feeling under the chest (diaphragm area? between ribs, where they go apart, in the middle that spot) that became worse with the hours. I also slightly had a sore arm. I even slept on it the same night. No fever, no muscle pain, no headache. When going to bed on the day of vaccination the pain has been severe and prevented me from breathing deeply or comfortably. I could not lay flat or straighten up. That was not all. Together with this pain I had green diarrhea and nausea. The next day I felt the same way but now it felt like the pain has spread a bit upward as well. I had difficulty swallowing.  I tried eating a soft apricot with tiny bites and chewed long before swallowing but yet it felt like swallowing a stone.  As if the way under my throat got tighter or inflamed. Taking a deep breath was painful as well. As if this pressure or tight feeling under the chest did not allow my lungs to expand. After calling a nurse from the emergency room, I went there to be seen in person. There they checked my heart, did an X-ray and basic blood work. Everything was good and the nurses and doctors could not help any further. The next day I kept having difficulty swallowing, but my stomach felt fine, even though I experienced diarrhea and nausea now for 3 days. Even if I did not eat, I would go to the bathroom, having diarrhea every time. Still many times a day, especially at night. There I thought it might have been an allergy and took 1 tablet of Benadryl. This helped with the pressure under my chest and I was able to eat some soft potato. Yet the throat discomfort stayed together with the diarrhea. One night and day I had a tingling feeling in my palms and legs. The next day my throat felt heavy. As if something was stuck or swollen and I could not swallow it. I was not able to eat any solid food and ate a lot of plain yogurt for a few days together with lots of water to stay hydrated. After eating yogurt my diarrhea would change form green color to yellow. This went on for few days. I kept losing weight since I received the vaccine. I was 125lbs and went down to 118lbs. Desperately I tried to reach a doctor, since I did not have any assigned. There was one who assigned me medication for acid reflux. I never took it because she diagnosed me over the phone and I never suffered from acid reflux. I went to the emergency room again. There the doctor just checked with a lamp over my throat and said I did not have any infection and sent me home. The next few days I started to experience dizziness. Mostly at nights again. When my under the chest pressure would worsen I would take 1 tablet of Benadryl and it would ease it a little. Another time I returned to the emergency room to get my abdomen checked. There blood work and an ultrasound was done. A nurse also gave me something to drink to calm my stomach but nothing changed. My stomach was fine. The pressure remained. The doctor said that my results are good. She also prescribed acid reflux medication. I did not take them as well. By now the diarrhea has stopped (after 1 week). Even when gradually introducing solid foods, there would be clear liquid instead of diarrhea. In the morning of 08/22/2021 I woke up with pressure pain on the right side next to my belly button and it felt like a piercing feeling inside it that prevented me from stretching or moving. After using the bathroom and during the day it went away but came back at night and stayed until today 08/26/2021. The stuck feeling in my throat remains until today as well, 20 days after the day of the vaccine. Occasionally I get tingling feelings in my legs or palms and sometimes shortly in my chest. Overall I do not feel healthy like before. I feel a little weak or not myself. All the doctors I have seen at the emergency room said they do not know what hurts or why and what happened. They are not even sure if it was an allergic reaction.