10yr old in Africa

Hi, my son has been having horrible fits this week, we live in Senegal, and its difficult to get help. 2mths ago we were flown to South Africa and they did an MRI, and ECG they were normal, he had no seizures at all in South Africa so the Dr put him on Depakine and he has been taking 8ml three times a day, he weighs 37kilos. In the beginning the medicine seemed to work, but over the last 2weeks he has been having very powerful seizures, where his muscles lock and his body spasms..I emailled the Dr in South Africa and he said he must have a blood test to test his levels....this all takes so much time and his dr here in now on leave for the next week. My son is so tired and worn out from the strength of these episodes and I'm at a loss at what to do...do I increase his medication..I feel helpless living here, and hes getting so upset at his inability to control them. Any advise would help, I am a bundle of nerves at the moment. thankyou.