I'm 20. I had loose stool one day in dec, then muscle weakness, nausea, light sensitivity, fatigue, dizziness, migrane &vomiting. Now IBS type symptoms?

Mostly migraine. Light sensitivity, fatigue, vomiting, dizziness, nausea all happen with migraine. The diarrhea was something else. It depends on how often you're getting these symptoms whether something else needs to be done. If you get frequent migraines you may want to talk to your doctor or a neurologist about preventative medication.
Parasympathetic . Irritable bowel syndrome is the multifactorial consequence of hormonal, immune system and nervous system dysfunction resulting from genetic predispositions and dietary and environmental insults. The predominant symptoms like diarrhea cramps constipation are the result of autonomic nervous system instability. Pts like you may benefit from a metabolically directed approach.

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Joint pain/tenderness/swelling, Dizziness/lightheadedness Loss of balance/cordination, Muscle weakness, Low libido, Eye light sensitivity/cloudy vision, Thinking/memory problems, Numbness/tingling, Severe fatigue, vaginal dryness, pain all over.

Consult PCP. This is indeed alot going on... sorry you are going through this .. dont suffer contact you PCP so she/he can run testing and workup. Feel Better! Read more...
See your doctor. That is and impressive list of symptoms, and certainly more than can be dealt with in 400 characters. I would recommend that you see your doctor ASAP. If you have already done so and you do not have a diagnosis, you should seek out a second opinion with a primary care doctor. Don't stop until you find some answers. Good luck. Read more...