From those indices, it's hard to make an educated guess. Kidney problems are a possibility but if there's no history of kidney problems, that too is unlikely. Doesn't sound like a cardio problem. One possibility is depletion of electrolytes (coupled with dehydration?) from the diarrhea causing unusual muscle cramping?
this is not answer still seeking answermany but drug withdraw can cause this.
shoes that are to small for you because they will smash your toe and it will cause Back pain
Pain in the stomach could be gas pain, and diarrhea at night could be just the flew. I would consult a docter.
Yes, Accutane can cause back pain. Back pain (and joint pain) are a common side effect of taking Accutane.
I am personally suffering from diarrhea/major pain because I ate half a bag of cherries yesterday. Don't do it. It's not worth the pain.
Watermelon can cause diarrhea (and/or abdominal pain and bloating), if you have an intolerance or allergy to watermelon.
There are many causes of gas and diarrhea, but the right shoulder pain is most likely "referred pain" due to the stomach distress. The phrenic nerve is involved... I've also had right shoulder pain after my c-section, and the doctor explained how it was due to the phrenic nerve getting irritated and extending the pain to the right shoulder.
Neck
quadratus lumbar
No. That would not be typical symptoms of a cold.
Can too much iron cause cause low back pain
Not really. It can cause Constipation, diarrhea, nausea, vomiting, and abdominal pain.