Dizzy and falling over?

I have had six sessions of TMS (Neurostar) so far. I leave with a headache and feel a little dopey and dizzy after each session then I feel kind of crappy the rest of the day. Today would have been session seven, but as I was getting ready I got a sharp pain on the right side of my head and fell over on my right side. I struggled to get up because I was very dizzy, but I when I did I fell right back over. Since then I have mostly been in bed because I have had a headache and been dizzy all day. It could be completely unrelated, but has anyone else experienced this from TMS? I'm scared now that something is wrong and I don't want to go back Monday.

​

The doctor has me doing 4 minutes five days a week. Twice someone other than the doctor did it and it didn't feel quite right. She didn't have the thing on my head tightly like when he does it and it hurt more than usual both times. Also, they "zap" on the left side of my head, but the lasting headache afterwards is always on the right side.