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How tall are you? How much do you weigh? Any weight change? Does anything make it better or worse? When did it start? Is it consistent? Is it getting worse? Any other symptoms including mental symptoms? Are you aware of anything which might have triggered it? Any medical problems? Any surgeries? Does anyone in your family have similar problems? Any family medical history?
What tests did you have so far?
Sorry for the delay. There was a medical emergency. Birth control pills could cause liver problem and hyperkalemia, hyponatremia. Hyperkalemia can cause ascending muscle weakness that begins with the legs and progresses to the trunk and arms. Chronic hyponatremia can cause fatigue, nausea, dizziness, gait disturbances, forgetfulness, confusion, lethargy, muscle cramps. Your symptoms are different from the symptoms such as twitches. Your doctor should have checked blood electrolytes. I don't think your symptoms are due to the birth control pills. Your symptoms are due to myoclonus. Clinical neurophysiology studies can be particularly helpful such as Surface electromyography (EMG), Simultaneous electroencephalography-electromyography polygraphy (EEG-EMG polygraphy), Somatosensory evoked potentials (SEPs), Jerk-locked back-averaging of EEG transients and/or SEPs to EMG discharges, Long latency EMG responses to peripheral nerve stimulation (eg, C reflex).