Dear-thanks for using our service .I read your question in detail and will give you my medical advise to your complaints. First of all,stomach cramps that moves from the right to the left could be related to gas. You need to review what food you are eating and if some of them produce gas.Examples as lettuce,broccoli,cauliflower,carbonated drinks , can produce it.You might had vomit due to gas or reflux. The headache could be related to indigestion to and back pain could be arthritic but gas can go to the back and give back pain. I recommend you to improve healthy diet and do exercise regularly . That will help the digestion and pain. If you still exhausted, make sure that you don t have anemia or an electrolyte imbalance. I hope that my advise has been helpful Dr.Sara