First you need to determine if you are having seizures or not. Then you need to determine is the seizures are epileptic or non-epileptic.
The fainting spells sound like they could be atonic "drop attack" seizures. Especially if you are never conscious of them when you fall/go limp.
I'm not sure about what you are calling the shakes. Tonic clonic/grand mal seizures involve loss of consciousness as well and are absolutely obvious to all bystanders. It sounds like you are describing some sort of mucle spasms that you are conscious of and partially able to control.
A neurologist or epileptologist should be able to run some tests to determine if you are exhibiting seizure activity in the brain although these test are not always conclusive (ie. Sometimes seizure activity does not occur while the tests are conducted).
Your fainting spells might also be associated with narcolepsy so you should seek a doctor to help you with a proper diagnosis. One thing you absolutely do not want is to start taking aeds (anti-epileptic drugs) if you don't need them!