4 month old Diastat

My 4 mo old daughter had a simple partial seizure on her right side, jerking of leg arm and face, on October 21st after taking Keflex for an eczema infection on her face it was in clusters lasting about 40 minutes. She had been on the Keflex for about 48 hours. Then again on the 5th of November after her 4 month shots. I did opt out of the Pertussis shot, however she did have the second seizure about 10 hours after the immunizations. This time on the left side with the same jerking of leg arm and face. I am very confused and hesitant about putting her on any meds, not to mention Phenobarbital or Keppra. My husband and I belive she has been reacting to the Keflex and the immunizations, with the jerking and the twitching. We saw the neurologist on Monday November 13the and was told in so many words that she needs to be on meds for at least 6 months. When we refused he got very rude and fustrated and sent us home with Diastat for her next seizure lasting more than 5 minutes. Help me with your experience in any of these meds with such a young child. None of these meds are reccommended for children under the age of 2. We were also wondering if we could just keep the Diastat on hand and give it instead of medicating her everyday with these adult meds.