Hi wonder if someone could give me some advice. I have been running for about four years now, minus two pregnancies

, and have signed up for the Manchester marathon. I have always just bought whatever shoes I could afford but because of running a lot more miles thought I should go and get properly fitted. I went to a running shop and they said I needed a stability shoe, instead of the neutral shoes I have been running in. Since I have been training in my new shoes I have got aches and pains when running that I have never had. I thought it might be because of upping mileage but have tried with my old shoes and it doesn't hurt. Is this normal when changing shoe style?i don't know whether to persevere with the new shoes or bite the bullet and go and get more neutrals, don't want an injury from running in wrong shoes though??i feel like I am running with bricks under my feet in my new shoes and it is totally changing the way I run. Any suggestions?
Edited: 25/01/2013 at 15:50