Welcome to the site.
I am a psychiatrist and i believe i can help you with your query.
Well, you see such a condition where there is no apparent organic pathology or medical condition but the patient continues to complain of distress or discomfort or presence of symptoms, then such a condition has been termed as Somatoform disorder or psychosomatic disorder, where it is believed that psychological distress which has got stored in one's subconscious mind over period of time becomes overwhelming and starts expressing itself in the form of bodily or physical symptoms. So, it leads to numerous hospital/ doctor visits, lot of investigations having been done but all these reveal no organic cause or medical condition.
So I reckon that you get yourself evaluated by a psychiatrist and get yourself started on an anti depressant such as duloxetine at dose of 40 mg per day to be taken at night time. This will help your symptoms to subside and you shall be able to overcome his condition.
Alternatively, you may seek CBT therapy which is a specialized counseling to be sought from a clinical psychologist and this shall too help you to cope with this condition , although it may take several weeks for you to achieve relief through his while the medication may help your cause faster.
I hope his helps you to understand this phenomenon called as somatoform disorder , you may search it further to know it better.
Wish you all the best.
Please kindly leave a POSITIVE RATING if you are satisfied with the answer.