Can too much medication make seizures worse?

Hi I have been on Depakote for the past 5.5yrs and over the past 9mths have been suffering from horrible side effects that have never occurred before. They occur about 1-2hrs after taking my AM dose, eg: dizziness, nausea, dirrorea, increased ringing in ears, vertigo, difficulty concentrating or focusing on anything. Sometimes I wake up like I am in a fog. All this leads to anxiety which automatically makes things worse.

Up until 9mths ago I was on 1500mg/daily and due to these side effects I have been slowly decreasing the dosage and am now at 750mg/daily. My previous neuro mentioned that too much meds can increase the likelihood of seizures. That totally freaks me out, so whenever this feeling comes on I worry about having a seizure and so I feel like I'm on a treadmill I can't get off of.

I recently tried switching to Lamictal but the side effects became even worse. My new neuro made me feel rather stupid by saying she'd never had anyone in 5yrs have any reaction to the drug and I should just try halving or quartering the dose. I told her no thanks. Apart from those 2 drugs I have also had an awful reaction to Tegretol.

I have 2 young girls and feel awful that I can't be a good mum to them when I'm doped up on medication. My husband is great but he has to hold down a job which involves travel.

Does anyone know of any meds that have few side effects and something that your body will tolerate when you are trying to get off Depakote? Or does anyone know of the smallest dose allowable for someone on Depakote? I'm not someone who has a great deal of seizures and I'm wondering whether the meds are really worth continuing on with. Any advice is most apprecited.