Strange symptoms that look like IBS?

3 weeks ago I suffered some sort of a shock: I was very tired the entire day, and suddenly some sort of adrenaline rush kicked in, making me jump around. It was all over in some hours. Right after that I felt like nothing has ever happened.

Problems appeared afterwards: each time after eating my heart rate increased, I got very tired and had to stay for 20 minutes in bed until I got through. Sometimes suddenly I could feel "shocks" on the left side when I felt food moving around. They persisted for about 2 weeks and got milder. But the story is not over...

I began to feel sudden episodes of feeling very tired sometimes. Now these can be linked to the deep anxiety I developed in the meanwhile.

I went to all possible doctors: 2 ultrasound scans, 1 MRI, 2 sets of blood tests, EKG, heart doctors and no one could find anything or give me something to visibly relieve the symptoms.

Now strange thing is that after these episodes: sometimes I feel anxious for no reason. Sometimes panicked after I go to the toilet. When I feel the bowels moving on the left side it stuns me for a short time without reason. I know it could be pure anxiety disorder, but I did not have such sudden pulses of panic before. It comes from nowhere and without reason.

Does somebody also have these strange symptoms?