Worried parents looking for some advice

Hi, we have a toddler (4 yrs old) who has recently started having seizures. He was a perfectly healthy boy up until this point. We’re new to this site. We were hoping to see if there are similar cases out there and what treatments work for you or your love one. About 3 months ago, he started complaining his left leg shakes. One day in daycare, he lost strength in the left leg and fell over. Ever since he’s been getting seizures few times a day lasting less than 30 seconds. During the seizure, he’s conscious and understands what’s we’re saying to him. Originally the seizure was around his left leg shakes and then his whole body tenses up. Now it’s more like his entire body cramps up and he can’t breathe. Usually he kind of know when the seizure about to come but lately they come without warning where he just drops wherever he is or doing. It usually takes him few minutes to recover full strength like standing up or acting normal. Once the shake is over, he acts very normal. You can’t even tell he just had a seizure. We have taken to him to ER. He has gone through 2 EEGs and 2 MRI and all 4 times results show no abnormality. We took him to ER because his leg started to limp. Hence the reason they took another EEG and MRI. He has been on Kappra which didn’t work. It decreased the intensity (30 sec to 10 sec) but increased the frequency from ~5x to 9x a day. And that was after few times of increasing Kappra. After few weeks, doctor switched the med to Depakote. During the med. change, about 1 week to 10 days all his seizures have creased. We’ve noticed as we were decreasing Kappra, the seizure came back more intense and more frequent now. We have increased Depakote 2x now and he’s still getting seizures (~7-9x/day). Before the 2nd increase of Depakote, his seizure was the worse we have seen. It was so intense, his head started to twitch along with his body shaking and it lasted more than a min and couple of times more than 2 mins. We have asked Dr. to try a new med but he’s recommending my son does an overnight EEG. This is where we are now. We are waiting to bring him into CHOP. If anyone knows or has someone who is going through something similar, please let us know what treatments work for your child. We are so worry and concern. Any help or advice is greatly appreciated.