This is strange what can i do?

It first happened when i was walking down the stairs i became really self aware and conscious where i was steping and worried that i would fall down the stairs and it made me all jerky.I just been sat on my bedroom floor for five minutes because i almost collapsed when i tried to step off the top of the stairs. Then i got it when i was walking normaly. Now it seems to have spread to the rest of me. I just got it whan typing. I have had seisures but am thinking this is psychological It comes and goes by the way. Has ANYONE ever heard of anything like this