Is there any medical reasoning that suggest that there is linkage between seizures, migraines and bipolar disorder?

I've had migraines since childhood. After hs grad, I was involved in a car accident and suffered head tramma. Shortly after I was diagnosed with seizures. I've taken tegratol, phenobarbitol, dilanton, deprakote, klonapin [singular and every different combination possible], to try to get control of seizure control. Currently, i'm taking felbatol and keppra, which for the most, seems to to the best control i've had.

The side effect of these different med's go from headache and nausea to depression, etc.

The reason for my asking this question is my mil, who is a retired pediatric nurse, insist that I am and have always been pneunamic depressant or bipolar. I have stood my ground to say this is not true - the side effects of these different meds may have made it look like I was suffering from bipolar; but, that's the meds - not me!

Is there any linkage between migraines, seizures and bipolar?