What was this brief illness I had and what was my medication?

Twelve years or so ago I became so weak I couldn’t hold my head up one day. I put it down on the table when choosing wallpaper! After a couple days of this I called my old doctor and she called in some medication and I was well very quickly. Does anyone know what was wrong with me and what the medicine could have been? It feels like it’s coming back lately but not as severely. I have no other symptoms.