Issues with stomach and anxiety.

Last year 2019 during december suddenly I felt nausea while having my lunch and after that feeling stayed for 3days until I met my gp.He told me dysbiosis and gave medicines.After that I was ok. But recently from month of April I faced same issues loss of appetite nervousness constant heart palpitations anxiety. Also loss weight.So I gone through all test hemoglobin sugar thyroid rbc.Ecg detected sinus arrhythmia.Reports were normal.I took various medicines for acidity and gas.But this problem sometimes settled down then again it comes back. My concern is that is it only because of my anxiety problem or is this making me anxious.Is there any thing wrong with my digestive system.Because every time I feel anxious it starts with a strange feeling inside my whole stomach to upwards that feeling is very awkward strange breathlessness it makes me nervous shaking palpitations and nausea. But when my stomach is in cool state I feel relax and less anxiety.