frustration....

I ran into a problem the other night while blogging-It is telling me that I have run out of space when it comes time to uploading pictures.  It asks if I would like to buy more space, It also said that you are only allowed 1GB of space(sadly I guess I've used up that much) my pictures are really big files.  The weird thing is that it gave me that window the other day and tonight I was able to make one post and now it wont let me make any more because I am "out of space." Any one else had this problem before?