I was diagnosed 20 years ago, a year after the birth of my 2nd child. Spent the first year of her life suffering all the usual symptoms only to be told by an unsympathetic gp that what did I expect with a small baby! Eventually saw a lovely gp who knew immediately what the problem was. As soon as blood tests confirmed her diagnosis I started on levothyroxine and felt so much better. Still on it today and feeling great.