This is Dr. David
your neurologist should do EEG testing to see if you have seizures.
if you are having seizures, you need to be on anti seizure medications
you could have a hernia in your groin area if you have had hernias before. you need an ultrasound of your abdomen and groin areas to check for hernias.
what sort of arrhythmia of your heart are you having?
it doesn't sound like the gabapentin is working for you. gabapentin dose has to be started slowly at 300mg a day and then slowly worked up to 900mg three times a day. you can't start it at that high dose.
your pain in your body could be coming from pinched nerves in your spine if you have spondylosis of your spine.