HiI need to buy a new mattress as I'm getting pain in between my shoulder blades (this always happens when I need a new bed).I'm 5'8" and 13 stone and my husband is 5'11" and 18 stone.Dreams seem willing to sell me any bed I'm willing to pay for; as I walk round I'm told almost everyone is suitable.Benson' were short on beds to try and I didn't like the ones I did try.John Lewis had a good selection but the sales assistant told me I needed a medium bed even though the firm one felt much better to me. She said it was too firm for me? https://www.johnlewis.com/john-lewis-natural-collection-7000-british-fleece-wool-pocket-spring-mattress-medium-king-size/p2429086I love the feeling of a fairly supportive bed that has lots of padding on the top (so not like lying on a brick). I'm sleeping on a firm combination mattress at the moment, 1400 pocket springs. It was great until a few months ago although it's just over 7 years old now.Please help , I can't find a new mattress!Many thanks for your time.